Making the gear change questions

[MERCMAN]

Took the Black Beauty in for the pre-Marauderville check-up and oil change. I have noticed that the rear end is noisier than I like so I had the dealer check it out. They agree that it is a bit noisy so they are replacing the gears under warranty. I am going to have them install Ford Motorsport 4.10's along with new plugs, oil change and shifter adjustment. Other than having to adjust for gear ratio, are there any things I need to know about driveability or wear issues?

[fastblackmerc]

Took the Black Beauty in for the pre-Marauderville check-up and oil change. I have noticed that the rear end is noisier than I like so I had the dealer check it out. They agree that it is a bit noisy so they are replacing the gears under warranty. I am going to have them install Ford Motorsport 4.10's along with new plugs, oil change and shifter adjustment. Other than having to adjust for gear ratio, are there any things I need to know about driveability or wear issues?

Either use a good 75w 140 synthetic gear oil or Ford gear oil and friction modifier. Follow the break in procedure that the mechanic recommends.

[MERCMAN]

Either use a good 75w 140 synthetic gear oil or Ford gear oil and friction modifier. Follow the break in procedure that the mechanic recommends.

Would it be a safe bet to assume that a dealership would use that?(I trust these guys as they have really gone the extra mile for me for 25 yrs)

[SpartaPerformance]

I assume you have a hand held tuner, you're going to need to change the gear ratio on that for correct speedo readings. I'm not sure but you may also need a tune for shift points but don't quote me on that.

[Local Boy]

10-4 on the speedo, and shift points in your tune, it will shift sooner and possibly conflict with your T/C locking schedule...

Check with Darrin from BC auto (vendor here) he'll give you the scoop...


BTW: I don't think that dealerships ever use synthetic oils unless specified...Decreases the profit margin...

Aloha

[RF Overlord]

are there any things I need to know about driveability or wear issues?The only driveability issue you'll have is trying to keep your foot out of it. :burn:

As far as wear, there should be nothing different with 4.10s over the stock gears. Definitely do as fastblackmerc said and use 75W-140 synthetic. I have the Valvoline version in Phoebe now and she's as quiet as a mouse. It also has the required friction modifier built in. Your dealer *may* use synthetic as that's what is supplied in the axle TSB kits, but they will probably use conventional 80W-90 as that's what the car came with from the factory. Make your wishes known up front to be sure.

[1stMerc]

My dealer aked if i wanted synth or conventional in the diff.

[fastblackmerc]

My dealer aked if i wanted synth or conventional in the diff.

I assume you said synthetic?

[1stMerc]

Most assuredly. And was on the road to Kentucky the next day. No problems, nice and quiet.

[MERCMAN]

Gears are being installed today. They are using synthetic. I will pick it up on Monday and test it out . Looking forward to :burn:

[1stMerc]

Coolness, you get the weekend to calm yourself down and decide how you're going to break them in. Gentle or b*lls to the wall for those first 500 miles. Gotta admit i didn't totally adhere to my installers instructions, but i did for those first intial drive and cool down cycle miles on the trip home from the shop.

[MERCMAN]

Installer said to just drive it, no restrictions, which is good because I am planning the long trip to NC next month.

[MERCMAN]

Well, the gears are in, tune is in.. WOW!!! this a MUST DO mod. BIG difference!!

[RF Overlord]

What took you so freakin' long? We all knew that years ago... :lol:

[MERCMAN]

What took you so freakin' long? We all knew that years ago... :lol:

Well, since I had to have the gears replaced under warranty, no labour! BONUS!!!

[MM2004]

Charlotte and I spent this past weekend with Dan and Julie.

Before we hoisted too many beers, Dan and I took his Beast out on Sunday for a 'test' drive.

:D

At stop sign practically in the middle of nowhere, my turn to be pilot for the return flight.

Car felt a lot more responsive than mine and got under way with less fuss than with the stock 3:55's.

No cars in sight and brought us down to a complete stop.

From a dig,...

Bwaaaaaaaaaaaaaaaaaaaaaaaaaa!

1-2 shift about 5,900
2-3 shift about 6,100

Nextel. Done.

Dan's car runs and sounds better than it ever has.

Now where's those beers.

:beer:

Mike.

[Mr. Man]

Charlotte and I spent this past weekend with Dan and Julie.

Before we hoisted too many beers, Dan and I took his Beast out on Sunday for a 'test' drive.

:D

At stop sign practically in the middle of nowhere, my turn to be pilot for the return flight.

Car felt a lot more responsive than mine and got under way with less fuss than with the stock 3:55's.

No cars in sight and brought us down to a complete stop.

From a dig,...

Bwaaaaaaaaaaaaaaaaaaaaaaaaaa!

1-2 shift about 5,900
2-3 shift about 6,100

Nextel. Done.

Dan's car runs and sounds better than it ever has.

Now where's those beers.

:beer:

Mike.
A '68 Volkswagen Beetle is more responsive than a DTR:D:P

[rayjay]

DTRs are that color because they sucked the blood out of a SB while blowing by it. :banana2:

[DTUB]

Took the Black Beauty in for the pre-Marauderville check-up and oil change. I have noticed that the rear end is noisier than I like so I had the dealer check it out. They agree that it is a bit noisy so they are replacing the gears under warranty. I am going to have them install Ford Motorsport 4.10's along with new plugs, oil change and shifter adjustment. Other than having to adjust for gear ratio, are there any things I need to know about driveability or wear issues?
Get a tail shaft lube kit.

[fastblackmerc]

Get a tail shaft lube kit.

Why?.....................

[MM2004]

DTRs are that color because they sucked the blood out of a SB while blowing by it. :banana2:
^^^ Da Troof!! ^^^

:D

Mike.

[Mr. Man]

DTRs are that color because they sucked the blood out of a SB while blowing by it. :banana2:
You're in denial son and I ain't talking 'bout the river in Egypt:D

[magindat]

The output shaft will now spin more times per mile per hour. Tailshaft lube is a nice addition.

Keep in mind that the stock shaft is balanced to a certain RPM of it's own - which I don't remember, but is something equivalent to about 121 MPH on 355's. This is because the shaft starts to banana and vibrate above that balanced RPM. That said, the same vibration on 410's sets up at a lower speed like around 115.

Therefore, your next 2 mods are a better higher RPM balanced shaft and a transmission tailshaft lube to reduce wear since it's now spinning faster than it would in stock dress.

[Mr. Man]

The output shaft will now spin more times per mile per hour. Tailshaft lube is a nice addition.

Keep in mind that the stock shaft is balanced to a certain RPM of it's own - which I don't remember, but is something equivalent to about 121 MPH on 355's. This is because the shaft starts to banana and vibrate above that balanced RPM. That said, the same vibration on 410's sets up at a lower speed like around 115.

Therefore, your next 2 mods are a better higher RPM balanced shaft and a transmission tailshaft lube to reduce wear since it's now spinning faster than it would in stock dress.
Doesn't changing the gears in the differential just change how fast the axles spin? Why would the driveshaft spin any faster?

[magindat]

Here's the math: http://www.magindat.net/ssm/info/4r70wratios.xls

For the same mph or rear wheel speed, the axle will turn more times the lower the gear (higher the number) as will the engine - resulting in higher rpm per given same mph.

Or the converse. For the same axle spin speed, the resultant mph will be lower.

[babbage]

The output shaft will now spin more times per mile per hour. Tailshaft lube is a nice addition.

Keep in mind that the stock shaft is balanced to a certain RPM of it's own - which I don't remember, but is something equivalent to about 121 MPH on 355's. This is because the shaft starts to banana and vibrate above that balanced RPM. That said, the same vibration on 410's sets up at a lower speed like around 115.

Therefore, your next 2 mods are a better higher RPM balanced shaft and a transmission tailshaft lube to reduce wear since it's now spinning faster than it would in stock dress.

Good advice. I'd also add that you should break the gears in with regular dino oil for the first 500 - then flush it out for a good group iv synthetic like AMSOIL, RP, Redline that already have the FM in them.

You can get a dynatec 4" driveshaft from Reinhart or find a MMC police shaft from a 99 or 2000 P71 - to get rid of banana problem. If you want high end you can also get a carbon fiber drive-shaft. I've been looking at these:
http://www.pstds.com/critical_link_drive_shafts.htm

[Mr. Man]

Has anyone tried the driveshaft exchange? Says in their ad they balance to military spec.

[GreekGod]

Has anyone tried the driveshaft exchange? Says in their ad they balance to military spec.

It isn't a balance problem...the drive shaft whips/flexes/bananas. The OEM quality/design/engineering is inadequate for 4.10 gears, account of load/speed.

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