4.10 vs 4.30

[LVMarauder]

Since my SCMT and Eibachs are in the mail its time to start my next mod. Gears. Who has 4.10's and wishes they had gotten 4.30's and who has 4.30's and whishes they had gotten 4.10's. Who has gotten 4.10's and is completely satusfied with them. There is a serious torque increase no matter which one i choose , I just want to get everything right. And yes I have read all the threads concerning this. I still have to be able to take it on the highway and make some warp speed romps occasionally when conditions permit. Thanks.

[darebren]

I live stop light to stop light and wish I would have gottent he 4.30's instead of the 4.10's. But since I might end up getting lower profile tires soon, I'll end up with about a 4.26 per my rainman type calculations.

[SergntMac]

I spent a lot of time OTR this summer, the 4:10s are the perfect balance between performance and economy, IMHO. 21-22 MPG, cruise at 80 all day long.

[Agent M79]

The combination of the 4.10's and the tranny program have reduced the band of "civil manners" for the car to about the 1st 25% of the pedal.

Anything above that and the beast starts showing it's true pedigree.

There is the occasional passenger that I prefer not to scare too badly. I am guessing that with 4.30's I'd have to really creep off the line and try very hard to feather the pedal lightly just to avoid giving them whiplash and a permanent facial tick.

[BillyGman]

between 4.10 gears, and 4.30's on the highway in O/D traveling 70MPH will only be a mere 120RPM's so you really aren't going to be able to tell the difference in acceleration, top end, or gas mileage if you were to go w/4.10's or 4.30's. So it's no biggie. We're talking about splitting hairs here. Now going to 4.56's like I have, you'll notice a difference. I've had 3.55's, 4.10's, and now 4.56's in my MM.

[DONP1217]

LVMarauder,

Live with no regrets. Go with the 4.30s. If you don't you'll always wonder if you should have gotten the 4.30s instead of the 4.10s. You should only be turning 2900 rpm or so with the 4.30s at 80mph. That is no big deal.

[Slowpoke]

i've got the 4.30's and dont do a whole lot of highway driving. of course, i dont do a whole lot of drving at all, of course, but thats a different story.

For mostly city driving i would highly reccomend the 4.30's. she handles nicely on the highway too, but i dont keep her above 85 for any long period of time.

[Murader03]

I've got 4.10's and now the tires are all the same on all four corners. I went with the smaller tires, which now allows to rotate them all around. I'm pleased with the 4.10's. My MM is a daily driver and I average 20 MPG OTR. It's going to be a matter of choice on what "YOU' want the car to do. OTR, I think I'd stay at 4.10, my $.02's. I totally agree with Mac, although I don't have the power adder he has.

[merc]

I think there are a few other considerations to review when selecting your gears. If gears are going to be your super mod then get the biggest. I must ask, what are your targets for RWHP and Torque? Considering I can spin OEM tires with 4:10’s gears without any problems, the question becomes is this the wrong solution for track and street racing. What I am attempting to say is consider the 8.8 Rear as a total package. This was method I used in choosing my gear setup.

If you can’t put the power to the floor and make it stick then gears are a wasted thought. I would ask around about a new posi unit also. It’s nice to electrify your soul with a full trouble burst, but in the real world we often stay within the posted limits. Road trips are fun with the Mercury Marauder Land Yacht; don’t limit yourself by leaning heavily toward speed.

[LVMarauder]

Thanks's Everyone one who has replied thus far.

I want to break 300 rwhp and be under a 14.0 et to start with and work from there.

Don-I agree I know the 4.10's would be satusfactory but the 4.30's would give me shiot-eating grin everytime I started it up.

Merc-Yes gears are going to be a bnig thing for me as i do not plan on S/C ing. Is a full rear end replacement nessacery? as was said by BillyG we are spliting hairs as the .20 ratio between 4.10's and 4.30's isnt alot compared to the .55 difference between the 4.10's anmd 3.55's.

Murader-As for what I want the car to do.... I for sure want lots of low end thrust, pin-you-to-your-seat-make-you-grunt-cuz-of-g-forces type acceleration.

Slowpoke-I do mostly city driving an limted highway use and long trips are even less frequent.

Agent- Whiplash is tight

Dareben- what tires are u getting?

[CRUZTAKER]

I have 4:10's and like them, but I do ALOT of highway travel...keeping up with EVERY meet I can get to! If this wasn't the case, I would rather have the 4:30's. So little difference afterall. I may swap someday, but the $450 total cost may be hard to digest. If you are staying n/a, do the 4:30's...your profile you provide seems to put you in that category, and I can assure you, you will be impressed.

-Barry

[Rat]

Got 4:10's and like them but if I had it to do over the 4:30 or 4:56 would be the way to go. Live in NW AR in the mountains and to 4:10's really helped but still lacks a little. Thinking seriously about SC if I can get someone in this part of the world that I think is qualified to install. May wish I had the 3:55's back.

[Hemlock]

SAME REPLY AS BEFORE , HAVE 4.10 NOW , WOULD DO 4.30 IF I DID IT ALL OVER AGAIN . THE HEAVY MM WILL MOVE QUICKER WITH THE LOWER GEARS . YOU WILL NOT RUN OUT OF TOP SPEED WITH EITHER GEAR , 5300 RPM +430 =150 MPH CHEERS !!

[LVMarauder]

Im leaning heavily to the 4.30's.

F-150 All Ring Gear Pinion Set 8.8 Axles 4.10:1 Ratio M-4209-G410 139.00


F-150 All Ring Gear Pinion Set 8.8 Axles 4.30:1 Ratio M-4209-G430 169.00 Set

Price difference is not bad. however they say F-150 model, does that matter? this is from diversified products marketing.

Also if i get 4.30's , who highly recommends i get a different drive shaft? I heard the 1999-2000 PI shaft is MMX composite.

[kurly]

I'm leaning towards the 4.30's too.

Does Dennis offer these along with the Stage I stuff?

[Slowpoke]

i bought my 4.30's from Dennis

[sailsmen]

4:30's = MMX driveshaft. With 4:10's the vibration started @100 to 105.

It is not a large vibration but if you drove a car with a MMX you would definetly notice the difference.

W/ a 1/4 mile trap speed of 97+ mph you are reaching the vibration zone at the track with the 4:10's.

I will also be going with the Stallion TC so the 4:10's are just right.


I currently have traction problems with the 4:10's so the Stallion = wider rims and tires!

[03SILVERSTREAK]

Originally posted by Murader03
I've got 4.10's and now the tires are all the same on all four corners. I went with the smaller tires, which now allows to rotate them all around. I'm pleased with the 4.10's. My MM is a daily driver and I average 20 MPG OTR. It's going to be a matter of choice on what "YOU' want the car to do. OTR, I think I'd stay at 4.10, my $.02's. I totally agree with Mac, although I don't have the power adder he has.

Im considering a Gear change over in the near future ,but I am wondering what you did or had done to set the front and rear tires the same ? I have a 300B series would reflashing the EEC work or do you have a suguestion ?http://smilies.sofrayt.com/1/k/turn.gif

[BillyGman]

I didn't have any problems w/the MM stock driveshaft when I installed the 4.10 gears, but when I went to the 4.56's the driveshaft began to vibrate every time I hit 90MPH and continued to get worse the faster i went. So I bought the pricey Dynotech metal Matrix shaft, and the vibration at 90MPH is gone, but it will start to vibrate at 120MPH. That's okay w/me though since there are times when I take the car up to 90MPH, but it's rare that I ever am tempted to take it past 120MPH.

[SergntMac]

What ever y'all decide to do here, don't ignore, or, forget adding the FRPP stud kit, or, girdle. These simple parts add years to your back end. Trust me, I've been here and done this. "Measure twice, cut once" works for me...IMHO.

[Slowpoke]

Hey Sarge - do I need this??