Ford Racing Gear Whine

[Rider90]

Everything is contacting where it should be, in fact, the area it contacts is identical to the area contacted on the 3.55 gears. We've taken my rear end apart to re-shim since perfect just isn't working, each different shim not eliminating the whine just moving it somewhere else. Everytime we took it apart to re-shim it, it was my idea, and against the expertise of the mechanic of which has over 20 years in the auto repair business. This past thursday we took it apart together and he showed me everything I needed to know so all we did was take out some extra back-lash. We did that and it reduced my whine by about 5 MPH. Instead of whining between 65 and 80 it now does about 65 and 75.

Should I conclude that it is the cut of the Ford Racing 4.10 Gears?

[twolow]

Would you like some cheese with your whine?



Sorry, couldn't resist.

[carfixer]

Motorsport gears go through less finishing processes than OEM gears which is why they cost less than 1/2 the price of OEM gears. The side effect is some of the gear sets whine. Many of the people that say their FMS gears don't whine just can't hear it over their exhaust.

[BillyGman]

I've been in a 70 chevelle that had Richmond brand 4.11 gears, and they whined so loud in just about all RPM ranges, that it sounded like we were riding in a truck. That's how Richmond gears are, and his exhaust was also loud. But my Ford racing 4.10's as well as my 4.56's cannot be heard whining at any speed. However, what does whine a little bit is this aftermarket driveshaft(the Dynotech ones).

I know that it's the driveshaft, because the day that I installed it, I immediately heard the whine from 35-65MPH, and the driveshaft installation was the only thing that I did at that time. It isn't a real loud whining though. So did you also install a different driveshaft too? If so, then that noise might be the driveshaft, and it's harmless.

[the_pack_rat]

Motorsport gears go through less finishing processes than OEM gears which is why they cost less than 1/2 the price of OEM gears. The side effect is some of the gear sets whine. Many of the people that say their FMS gears don't whine just can't hear it over their exhaust. How are the quality of the Ford OEM truck gears vs passenger car ?.

Trucks & SUV's are the only vehicles one can get 4.10's from the factory in AFAIK.

Would those be much LESS likely to whine ?.

[chucky]

what does the pattern look like? Ive ran 12bolts with 4.88s on up to 5.38s and only heard very little whine out of them.

[MM03MOK]

what does the pattern look like? Ive ran 12bolts with 4.88s on up to 5.38s and only heard very little whine out of them. {off topic} Chucky - love your avatar! {on topic}

[fastblackmerc]

{off topic} Chucky - love your avatar! {on topic}
I have FRP 4:10's installed and they are as quiet as the original 3:55's were... ie. no whine or any noise whatsoever. Have about 8,000 miles on them.

[Blackened300a]

4.10 FMS Gears installed with stock driveshaft. My installer went through every single possible measurment and sure enough, WHINE!! If I accelerate, they are quiet, if I let off the gas and the car is holding itself back, they are quiet, If I give just enough gas for the car to carry itself and maintain speed, WHINE!!!!! I just delt with it and drown it out with the radio or just ignore it its not that loud, but its definitly there.

[twolow]

You guys make me want the 4.10 one day and not the next.

[Rider90]

what does the pattern look like? Ive ran 12bolts with 4.88s on up to 5.38s and only heard very little whine out of them.

Chucky, I am not the tech at this but I was shown what everything looked like, I took a good look as he explained how things were and then compared them to the stock 3.55 gears and it was dead on. If I can get a hold of my brother, I'll ask him how to explain what we've gone through.

[Rider90]

You guys make me want the 4.10 one day and not the next.
Ryan, without a doubt you want them. The question here is, which brand? If this keeps up it looks like my next mod will be some 4.10 gears the second time around.

[Rider90]

4.10 FMS Gears installed with stock driveshaft. My installer went through every single possible measurment and sure enough, WHINE!! If I accelerate, they are quiet, if I let off the gas and the car is holding itself back, they are quiet, If I give just enough gas for the car to carry itself and maintain speed, WHINE!!!!! I just delt with it and drown it out with the radio or just ignore it its not that loud, but its definitly there.
Glad to hear I'm not alone. I feel yer pain.

[FordNut]

Mine never made a sound. 'course now that the exhaust has been upgraded you wouldn't hear it anyway.

[FordNut]

You guys make me want the 4.10 one day and not the next.
Call Scott, as far as I know nobody who he has upgraded has complained of noise.

[carfixer]

How are the quality of the Ford OEM truck gears vs passenger car ?.

Trucks & SUV's are the only vehicles one can get 4.10's from the factory in AFAIK.

Would those be much LESS likely to whine ?.
The 4.10:1 gears you buy over the counter at a Ford dealership are premium quality gears and are much less likely to whine, if set up correctly. These gears will cost upwards of $500 or more, when I last checked.

If these whine out of the box, you can bring them back for another set. You can't do that with FMS gears because they are sold as racing gears.

I've installed hundreds of OEM gears without any noise. Of the 1/2 dozen FMS gears I've installed, 2 sets whined. My gears whine exactly as Blackened300A described. My wife doesn't hear it but I do. It is very faint. The other set whined a little worse but it's a chance you take with racing gears.

[Rider90]

The 4.10:1 gears you buy over the counter at a Ford dealership are premium quality gears and are much less likely to whine, if set up correctly. These gears will cost upwards of $500 or more, when I last checked.

If these whine out of the box, you can bring them back for another set. You can't do that with FMS gears because they are sold as racing gears.

I've installed hundreds of OEM gears without any noise. Of the 1/2 dozen FMS gears I've installed, 2 sets whined. My gears whine exactly as Blackened300A described. My wife doesn't hear it but I do. It is very faint. The other set whined a little worse but it's a chance you take with racing gears.
Intresting. I never knew FoMoCo had different gears over the counter. Have you had any experience with Moser? I'm wondering which brand could be next.

[teamrope]

Boath of our FMS gears whine a little when you are just giving it enough gas to keep a steady speed, but I knida like the sound. :)

Do I need :help: ?

[Rider90]

Boath of our FMS gears while a little when you are just giving it enough gas to keep a steady speed, but I knida like the sound. :)

Do I need :help: ?
Thats the sound I'm talking about too.

[Blackened300a]

Boath of our FMS gears whine a little when you are just giving it enough gas to keep a steady speed, but I knida like the sound. :)

Do I need :help: ?
You do Need :help:
It's not a cool whine like a S/C, Its a whine that a GM Hydromatic Tranny used to make back in the day and Thats NOT COOL!

[BillyGman]

For you guys who still have the 3.55's, and who've been thinking about getting the 4.10's keep in mind that the "whine" that everyone's talking about here can barely be heard, and is a bit more noticeable only with a factory stock exhaust system since it's more quiet. That whine isn't even loud enough to be noticed by most anyone else but you. most of your passengers will never even notice it.

Like I've stated before, some other brands of gear whine so loud that everyone will hear it as soon as the car begins to move, even if they're installed properly.

[Rider90]

For you guys who still have the 3.55's, and who've been thinking about getting the 4.10's keep in mind that the "whine" that everyone's talking about here can barely be heard

I don't recall you driving my car, please enlighten me as to when this occured. The whine is very noticable, in fact after the gears were installed my girlfriend, not a car buff at all, got in the car and one of the first things she said when we hit the highway was "Whats that noise?" it is very noticable. It isn't subtle at all. I don't think you should mis-lead the people researching this topic as it does need attention and seems to be common with a few people who are also running Ford Racing gears.

[twolow]

I hear a whine when I step on the gas but when I followed the whining sound it ended up coming from my other half in the passenger seat telling me to slow down and drive 'normal'.

[BillyGman]

I don't recall you driving my car, please enlighten me as to when this occured. The whine is very noticable, I don't think you should mis-lead the people researching this topic as it does need attention and seems to be common with a few people who are also running Ford Racing gears.Woe, back off junior. First off, who's misleading anyone? I suppose that I could accuse you of being "misleading" since you're claiming that your alleged problem is "common" with Ford gears, despite the fact that I've never heard them whine after having three different sets of them. So how "common" can it be? But I haven't accused you of being misleading, have I?? If you think that I'm reading this whole thing wrong, or that I've misunderstood anyone here, then it's fine that you state that. But you sound like you've been pretty quick with accusations.

Secondly, from Teamrope's and Carfixer's discription as well as FordNut's description, it didn't sound to me like this sound is all that noticeable. If you have the stock exhaust, then it's likely a lot more noticeable in your car than in one that has aftermarket mufflers. But either way, let's try to be a little more civil during our efforts to communicate this gear "whine" via the written word w/out throwing accusations around about "misleading" people.:rolleyes:

BTW, do you have the Dynotech driveshaft? Because mine makes a whining noise, and it isn't the gears. And it isn't noticeable since I installed the Kooks headers and exhaust. and some of the Impala SS guys have also complained about the dynatech driveshafts making noise.

[Rkammer]

4.10 FMS Gears installed with stock driveshaft. My installer went through every single possible measurment and sure enough, WHINE!! If I accelerate, they are quiet, if I let off the gas and the car is holding itself back, they are quiet, If I give just enough gas for the car to carry itself and maintain speed, WHINE!!!!! I just delt with it and drown it out with the radio or just ignore it its not that loud, but its definitly there.
This is exactly the same whine conditions I have after having my 4.10s installed last week. I have about 500 miles on the install. The whine is very slight and only at about 50-70 and only in a very slightly loaded mode. It is very, very slight but my old ears have a hearing loss at high frequencies anyway. I'll have someone with better ears give an opinion this week.

[SergntMac]

Have FMS 4:10s that get a beating on a regular basis. No whine.

As this debate continues, I'm not sure this whine stems from gears. Bearings will make the same noise, and, using the lighter gear oil will unmask some normal gear sound. Also, check the tailshaft bearings, sound can travel (telegraph).

Jason, isn't DynoPro's dyno above ground? Can you get under it while it's "moving?"

[DEFYANT]

I have the gear whine also. Bearly noticeable w/ the Kooks.

[Blackened300a]

As this debate continues, I'm not sure this whine stems from gears. Bearings will make the same noise, and, using the lighter gear oil will unmask some normal gear sound. Also, check the tailshaft bearings, sound can travel (telegraph).

Its a Good opinion, But Wouldn't you hear bearings all the time?? And What type of lighter oil? Isnt Gear Oil all the same Weight? I used 76 Synthetic oil that my cousin uses in his FeatherLight Modified. It has a high temp rating along with anti-Friction elements. I still used the Anti Friction Additive from Ford but Its like having extra Protection. Im still convinced that its the cut of the gears that are giving the whining.

[Tinaree]

Richmond used to make FMS gears, and Richmonds are notorious for whining. And once you get a whine, you'll probably never be able to get it out completely.

Stiffer driveshafts tend to amplify it, while a tighter backlash tends to dampen it (but runs hotter). Improper carrier bearing preload can contribute to a whine that seems to sneak in after a few thosand miles. Reuse of the old crush collar is another trick that bites you later on, don't do it.

Is there a reason you guys are choosing 4.10s over 4.30s or 4.56s? Is that about right for the weight and redline at the track? Or is it just the "comfy gear" for GPs?

[Dennis Reinhart]

Everything is contacting where it should be, in fact, the area it contacts is identical to the area contacted on the 3.55 gears. We've taken my rear end apart to re-shim since perfect just isn't working, each different shim not eliminating the whine just moving it somewhere else. Everytime we took it apart to re-shim it, it was my idea, and against the expertise of the mechanic of which has over 20 years in the auto repair business. This past thursday we took it apart together and he showed me everything I needed to know so all we did was take out some extra back-lash. We did that and it reduced my whine by about 5 MPH. Instead of whining between 65 and 80 it now does about 65 and 75.

Should I conclude that it is the cut of the Ford Racing 4.10 Gears?
I have done hundreds of FMG gears and never had this problem, I use the Rotunda install tool the back lash and pinion depth is perfect if the original install was not done right it can cause a bad wear patern and the gears may need replaced, 4:30 are notorious for a whine

[Krytin]

I have the gear whine also. Bearly noticeable w/ the Kooks.
The "whine" I heard while you were passing me on the runway two weeks ago was VERY cool - but it wasn't coming from your rear!:banana2:

[SergntMac]

Is there a reason you guys are choosing 4.10s over 4.30s or 4.56s? Is that about right for the weight and redline at the track? Or is it just the "comfy gear" for GPs? Little bit of both. Not many real time racers here, who would trade off the comfort for the performance of taller gears. But, everyone loves the spirited on ramp romp, and 4:10s seem the middle ground either way.

[Bradley G]

"Jason, isn't DynoPro's dyno above ground? Can you get under it while it's "moving?"(quote)

Mac, yes it is the Big boy!, Dynojet!
I don't think it will be a problem to put Jasons car on the dyno, and check it out.
Is there an instrument like an automotive stethoscope to pinpoint the origin of his noise?

[SergntMac]

Is there an instrument like an automotive stethoscope to pinpoint the origin of his noise? Yes they are available, but if the whine is audible inside the car, I don't suppose it will be hard to track down.

http://www.brandsonsale.com/ht-001057.html?OVRAW=automotive%2 0stethscope&OVKEY=automotive%20stethoscope&OVMTC=standard

[Bradley G]

Thanks Dude!

The pic(s) of the Probe look painfull:eek:


Yes they are available, but if the whine is audible inside the car, I don't suppose it will be hard to track down.

http://www.brandsonsale.com/ht-001057.html?OVRAW=automotive%2 0stethscope&OVKEY=automotive%20stethoscope&OVMTC=standard

[Rider90]

Thanks Dude!

The pic(s) of the Probe look painfull:eek:
Brad & Mac, we have one of those tools over at our place. I already know its coming from the rear end, getting a first row seat to it would probably just piss me off :help: if you add the cost of the gears and the install, it would be a helluva lot of money to do it over again.

I'll hit Dynopro's Dyno after the U/D pullies and intake spacer, which should be soon now.

Thanks for the opinions guys, looks like an S.O.L. case.

[Glenn]

There has been many previous threads on the FR 4:10 gear whine. Bottom line, you take your chances with a much cheaper gear set then OEM. I knew I may have to put up with some whine when I did the install and was very pleased when I heard no whine. Maybe 10% or less have any whine. I have had mine installed for over a year and no whine at all. I also believe alot has to due with who is installing the gear set. You can't beat a Ford certified Master Mechanic.

Glenn

[sailsmen]

4:10 and No Whine :D

Well, no rear gear whine! :P

[SergntMac]

There has been many previous threads on the FR 4:10 gear whine. Bottom line, you take your chances with a much cheaper gear set then OEM. Glenn I am asking for clarity on this point. Are you suggesting that Ford racing parts are lesser quality that OEM production parts? If so, please identify the manufacturing resource for the Ford racing gears, I'd like to look into this myself, thanks.

[Bradley G]

No need to get Pizz'ed pal , Just get your mods and exhaust and be happy!:P
Brad & Mac, we have one of those tools over at our place. I already know its coming from the rear end, getting a first row seat to it would probably just piss me off :help: if you add the cost of the gears and the install, it would be a helluva lot of money to do it over again.

I'll hit Dynopro's Dyno after the U/D pullies and intake spacer, which should be soon now.

Thanks for the opinions guys, looks like an S.O.L. case.

[Tinaree]

I am asking for clarity on this point. Are you suggesting that Ford racing parts are lesser quality that OEM production parts? If so, please identify the manufacturing resource for the Ford racing gears, I'd like to look into this myself, thanks.
They used to be subbed to Richmond. Today, ????

[SergntMac]

They used to be subbed to Richmond. Today, ????
That's what I was hoping to learn from Glenn..."What's up today?"

Honestly, there are half a dozen reasons why rear ends whine, ring and pinion are only one. I didn't own my MM 24 hours and the rear end blew apart. Richmond. After a full rebuild with an Auburn diff, FRP 4:10s, lots of hard miles after that which included three pinion seals, still no whine.

I'm beginning to feel left out.

[Glenn]

Mac:

All I can say is I have gained alot of MM information from you and the many other far more knowledgable people on the net. It was my general understanding over a year ago I was going to take a chance on gear whine when I had my cheaper FR 4:10s installed. Some guys had reported whine, but most did not. I took my chances and I was lucky, I guess. But, the car really does need the 4:10 and it makes a huge difference and my gas mileage is still right on 20 mpg as it has been since the day I bought it.

Glenn

[Tallboy]

I think one of the most important aspects of gear whine is being overlooked here.

Your hearing.

I've been in cars where people swear they have no gear whine, and I can hear it plain as day. I've also been in cars where people complained non-stop about the gear whine I couldn't hear.

Take your advice from whomever you like. I'll be listening to the guy that does it for a living.:cool:

[chucky]

Rider

First off did you add Fords Friction Modifier?

There are 2 schools of thought on this, the older guys do it by feel & that’s fine, but it takes a lot of experience to get it right. For the other you need to follow the proper procedure get some specialized tools like a dial indicator & torque wrench and buy some extra crush collars and a blue chalk called Persian blue. & even then it can be tough.

<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p> </o:p>

Don’t take this the wrong way I’m sure your guy is a good mechanic but if you don’t have someone with the right experience or all the other things I mentioned then it doesn’t matter how good he is. Cause without either one it’s just a best guess.

<o:p> </o:p>

If you want the full procedure & a list of tools & parts you need PM me.

<o:p>BTW I tried it once it drove me nuts after that I always sent them out.</o:p>


Good luck

[Rider90]

Rider

First off did you add Fords Friction Modifier?

There are 2 schools of thought on this, the older guys do it by feel & that’s fine, but it takes a lot of experience to get it right. For the other you need to follow the proper procedure get some specialized tools like a dial indicator & torque wrench and buy some extra crush collars and a blue chalk called Persian blue. & even then it can be tough.

<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p> </o:p>

Don’t take this the wrong way I’m sure your guy is a good mechanic but if you don’t have someone with the right experience or all the other things I mentioned then it doesn’t matter how good he is. Cause without either one it’s just a best guess.

<o:p> </o:p>

If you want the full procedure & a list of tools & parts you need PM me.

<o:p>BTW I tried it once it drove me nuts after that I always sent them out.</o:p>


Good luck

Chucky, we used GMs friction modifier and have had nothing but good results in all applications. We ordered a few extra crush sleeves, which we needed since it has been apart about four times now. Also before closing the cover and filling it up with oil, we always painted the ring to make sure contact was how it should be. Again I cannot describe in technical terms, and my brother has been MIA the whole day now.

[Sully008]

Chucky, we used GMs friction modifier and have had nothing but good results in all applications. We ordered a few extra crush sleeves, which we needed since it has been apart about four times now. Also before closing the cover and filling it up with oil, we always painted the ring to make sure contact was how it should be. Again I cannot describe in technical terms, and my brother has been MIA the whole day now.
Jason,

Are you describing the tooth contact pattern?:

You are now ready to verify the tooth contact pattern. A gear marking compound should be used. Paint gear teeth with compound in several spots and rotate ring gear several revolutions. A tooth contact pattern will appear and should be similar to the pattern shown in Illustration 'C'. If the pattern is not in the approximate position shown, reset pinion depth and backlash to correct pattern. Pinion shims usually must be moved in .003 of an inch increments to notice a pattern change. If a pattern is heavy toe subtract shims, (See Illustration D). If a pattern is heavy heel add shims, (See Illustration E).

From this website: Link (http://www.usgear.com/ring__pinion_installation.htm)

Note: I've had my 4.10s in for 2 weeks now, no whine or noise. Was out on the highway today doing 70 mph. Even had a blast up to 100 mph. Again, no noise. I'm knocking on wood right now.:D

[BillyGman]

I installed the 4.10's myself, and then because they weren't enough for me (this was when my Marauder wasn't supercharged yet) I then installed the 4.56's myself, and niether of those gear sets (which were FMS gears) produced any whine at all at any speeds, and my exhaust was quiet then since it was the factory exhaust.


The one problem was that with the 4.56's, beginning at 90 MPH the stock driveshaft would vibrate badly(not whine, but vibrate), and it was imediately noticeable as soon as I hit that speed. So after puting another 300 miles on the 4.56 gears (and still no whine) I installed the Dynatech driveshaft, and as soon as I lowered the car on the lift, and drove it off into the street, I began to hear the whine of the new driveshaft beginning at about 35-40 MPH, and remaining until 65-70 MPH. It wasn't all that loud nor was it that noticeable, so it was no biggie.

And then when I put the Kooks headers and bolt-on exhaust on, I couldn't even notice the slight driveshaft whine at all, and I still don't today. And that was about 24,000 miles ago. So there's what has happened with my car concerning a slight whining noise. Again, with my car, it was never any big deal, and only was noticeable with the stock exhaust, and while "floating"(ie not hard on the gas, and not coasting, but just barely on the gas a little bit, and only between 35 MPH, and 70 MPH).

[Rider90]

Jason,

Are you describing the tooth contact pattern?:

You are now ready to verify the tooth contact pattern. A gear marking compound should be used. Paint gear teeth with compound in several spots and rotate ring gear several revolutions. A tooth contact pattern will appear and should be similar to the pattern shown in Illustration 'C'. If the pattern is not in the approximate position shown, reset pinion depth and backlash to correct pattern. Pinion shims usually must be moved in .003 of an inch increments to notice a pattern change. If a pattern is heavy toe subtract shims, (See Illustration D). If a pattern is heavy heel add shims, (See Illustration E).

From this website: Link (http://www.usgear.com/ring__pinion_installation.htm)

Note: I've had my 4.10s in for 2 weeks now, no whine or noise. Was out on the highway today doing 70 mph. Even had a blast up to 100 mph. Again, no noise. I'm knocking on wood right now.:D

Mike,
Thank you for the tips and links. I have faith in my mechanic, in this case it is my brother, and the occasional stop-in by my dad. He was in the auto repair business for 22 years before selling the business and moving into something else. Given that there are people with a similar sound and some without, I'm just assuming when you pay for the gears it is a toss-up and there is no way to assure you get the perfectly cut set.

My brother has had very good experiences with Richmonds, gears into the high 4 and mid 5 ratios especially. He has done a lot of gear installs, this one no different than the rest. Maybe each gear brand is a toss-up? The one were you gulp and think good luck during the order process. I talked to Brad yesterday on the phone and came to the conclusion this only means I have more of a reason to order some mufflers sooner than I thought.

I think we will take the rear end apart one last time to loosen the backlash to where it was, as the sound, as I drove it and noticed it more, now it comes on as early as 45 MPH but only under the conditions of feathering off the pedal after accellerating. I don't consider the sound to be too serious if I have to concentrate so I can get it to happen again, that I can shrug off. But now that we have moved the sound into the around town speeds AND the highway speeds, I can't see me liking that too much.

[BillyGman]

Mike,
My brother has had very good experiences with Richmonds, gears into the high 4 and mid 5 ratios especially. .Just a heads up for you and the rest of our readers of this thread......I spoke to Richmond gear company on the telephone, and they told me that their ring & pinion gear sets that have ratios of 3.90 and numerically higher have teeth that are cut differently, and that different cut causes whining noise even when they're installed correctly.

And I know that this noise that their gears make is much louder than the noise you and others have been talking about here, because when I used to ride in my buddy's Chevelle that had 4.11 Richmond gears, it whined all the time. The whine was very loud, and it was there during hard acceleration as well as light acceleration and during coasting too. In fact, it was very apparent during deceleration too. It was so loud that you didn't have to listen for it. You could here it whether you wanted to or not during radio listening, and conversation.But nothing ever failed with that gear set. it was installaed properly. The whine was simply because of the way those gears were machined. So i think you're much better of with Ford gears.

[Bonedriver]

Just to chime in with my .02...

I have FRPP 4.10's in my Vic (upgraded from 3.73's) and I have no whine what so ever. I've ridden in my buddies Mustang with 4.10's and they whine like a banshee. It comes down to the installer.

There are three measurements that have to be withing a very narrow margin: Pinion Depth, Preload, and Backlash. Tricky for anyone to master.

BTW I still get 19 MPG on the interstate (in 95 degree heat and with the AC on - down from around 20-21 MPG). I have Magnaflow exhaust and have no drone either....

[BillyGman]

Me and Jeff (aka "04MEMA") were talking via PM's, and he brought up an intersting theory, which may be dead on, and quite relevent to this thread.....


he said that maybe the Dynotech driveshafts for some reason are transmitting what little noise the Ford gears are making like a tuning fork of sorts. You never know how harmonics will travel, and since the driveshaft is connected to the rear end, this probably isn't a far fetched theory at all.

Sully is saying that he hears no noise, while guys like Rider90 and others (myself included) are saying that they do hear some noise (although in many cases such as mine, the noise was never any big deal since it was minor, and isn't detectable at all with an aftermarket exhaust). So maybe if the guys who do hear noise with these gears, have the aftermarket driveshaft, and the ones who don't hear any noises with these gears who even have the stock exhausts, also still have the stock driveshafts, then maybe that would explain this whole thing. Harmonics traveling through certain driveshafts that actually do originate from the gears, but cannot be heard with the stock driveshafts.

Does that sound like it could be a possibility here?:confused:

[Bradley G]

After riding in Jasons car yesterday, (radio playing softly) I wasn't listening for any noise,But It did not seem like, anything, out of the ordinary.
Probably too tired or too old to hear it.:P

[Rider90]

After riding in Jasons car yesterday, (radio playing softly) I wasn't listening for any noise,But It did not seem like, anything, out of the ordinary.
Probably too tired or too old to hear it.:P

I heard it! It isn't like a freight train, but it's there :P

[Bradley G]

Well no more riding in your car then!:D

Except! , if we don't finish the S/C install today! :help:

[Rkammer]

I have a totally stock drivetrain and I can hear it very faintly in mine in unloaded and very llight loaded condition.

[oldekid]

I have a totally stock drivetrain and I can hear it very faintly in mine in unloaded and very llight loaded condition.Ray,
I didn't notice any change in the sound after getting mine installed. It could be there, but possibly drowned out by my dual modes. You could do like Buck did, and cut out your mufflers totally. That will get rid of any gear noise. . . :baaa:

So, do you like your 4.10s other than the noise?

We missed you at the picnic. We had a pretty fun drive down and back.

[Tinaree]

Me and Jeff (aka "04MEMA") were talking via PM's, and he brought up an intersting theory, which may be dead on, and quite relevent to this thread.....


he said that maybe the Dynotech driveshafts for some reason are transmitting what little noise the Ford gears are making like a tuning fork of sorts. You never know how harmonics will travel, and since the driveshaft is connected to the rear end, this probably isn't a far fetched theory at all.

Sully is saying that he hears no noise, while guys like Rider90 and others (myself included) are saying that they do hear some noise (although in many cases such as mine, the noise was never any big deal since it was minor, and isn't detectable at all with an aftermarket exhaust). So maybe if the guys who do hear noise with these gears, have the aftermarket driveshaft, and the ones who don't hear any noises with these gears who even have the stock exhausts, also still have the stock driveshafts, then maybe that would explain this whole thing. Harmonics traveling through certain driveshafts that actually do originate from the gears, but cannot be heard with the stock driveshafts.

Does that sound like it could be a possibility here?:confused:
Yes. The stiffer a driveshaft, the higher the vibration harmonic; that is why people switch to aluminum, because it is stiffer than steel. Unfortunately, it also conducts vibration better, so the polyharmonics from the gears are amplified. This assumes apples to apples, because a bad gear install is still noisier than a good one.

[Rider90]

Well no more riding in your car then!:D

Except! , if we don't finish the S/C install today! :help:

We probably won't, we're being too careful :lol:

[TheDealer]

If you are looking for a normal gear pattern with marking compound, you're not going to find it. The Ford shop manual tells you not to read the pattern. Set the pinion, preload and backlash properly and you are done. I and others have looked at the pattern and it will look out to lunch with the gears measured and installed properly. If you are making adjustments using a marking compound, I don't think you will ever get it right. Once the gears are driven they are done. If they are noisey, you'll never fix them once they have been driven. Just my .02.

[TheDealer]

One more thing. I don't think changing backlash is your problem. It's pinion depth!! :beer: