What gears for a 08 GT

DarkFireGT · Jan 6, 2008

psfracer said:
Actually I think we are saying the same thing then.

---Because I totally agree, 4.10s without the proper setup will hurt you, not help. To take your example, if you threw on a whipple at 10psi, put on 4.10s, then showed up at the track with street tires and a stock suspension, you would be disappointed for sure.

I thought we were saying the same thing at the beginning, too. You confused me lol.

nosfed · Jan 6, 2008

Dont fear the gear!! Ive got 4.10`s with a Saleen blower 10lbs boost and love it. My wifes 08 vert is n/a and also has 4.10`s. My friends 04 Cobra would pull me out the hole by a car length when I had 3.73`s , now I pull him by a car then in second I pull another car length on him. These cars are heavy and need the 4.10`s to get it out the hole quicker. If you buy the 3.73`s or 3.90 it will seem quick at first but you`ll get used to it and then regret not getting the 4.10`s. Oh ive also got the factory 18`s.

stumpjumperpro · Jan 6, 2008

I am looking at buying a Stang, 05-08, not sure which yet. I had an '01 Bullitt with 4.10's and it was a beast for having nothing else done to it. But, the gas milage was horrible on the highway, about 13-15 mpg and it too had the "I need another gear" feeling when on the highway, but it was a blast to drive. I plan to put some aggressive looking 20" wheels on the new one. Would the 4.10's be best? Will the new gears void the warranty?

xxrequiemxx · Jan 6, 2008

I have an 06' and i get like 15.6 mpg.....

i am not to happy with that - but oh well!

fobra559 · Jan 6, 2008

stumpjumperpro said:
I am looking at buying a Stang, 05-08, not sure which yet. I had an '01 Bullitt with 4.10's and it was a beast for having nothing else done to it. But, the gas milage was horrible on the highway, about 13-15 mpg and it too had the "I need another gear" feeling when on the highway, but it was a blast to drive. I plan to put some aggressive looking 20" wheels on the new one. Would the 4.10's be best? Will the new gears void the warranty?

Just don't tell the dealer

anthony05gt · Jan 6, 2008

You're gonna love the 4.10's. It will wake that car up!

kooldawg6 · Jan 7, 2008

I have 4.10s in my auto and love them! I have run both the OEM 27.2" tire and 28.3" rear tire with no issues at all being a DD. I've put about 26K miles on her with the 4.10s since March. I do some "spirited" driving and avg 19-20 MPG. If I stick with the 28.3" or find a taller street tire that fits, I may go with the 4.30s until I go F/I(if I do).

kooldawg6 · Jan 7, 2008

stumpjumperpro said:
I am looking at buying a Stang, 05-08, not sure which yet. I plan to put some aggressive looking 20" wheels on the new one. Would the 4.10's be best?

The 4.10s will help being that you will be adding unsprung weight with 20s.

Sparty92 · Jan 7, 2008

I have been wondering the same thing.

My car is a daily driver, 5M, 3.55s, stock 17" wheels. I've been to the track 1 time in 2007, and don't have plans to go other than maybe a couple times a year.

What I am looking for is performance on the street and highway. Highway, in terms of MPG.....and street in terms of....well...uh, some good acceleration here and there.
(The first paved road in the USA, and unofficial factory muscle car proving ground, is a few miles away from me, Woodward Avenue, Michigan).

I MAY go to an 18" or 20" wheel. I don't want to add massive unsprung weight (I may autocross this car), so 20s will be my 2nd choice. I've found that the stock tires are very tall, with the size being 235/55/17. Most (all?) replacement tires in a 245, 255, 275 width (can't find and don't want 235s) are 50/45/40 in sidewall height. I never checked the O.D. but it seems like it might be lower than my current stock height.

Would 4.10s cause any problems on the highway? I've seen some muscle cars around here that burned up their rear diffs from driving on the highway for too long, or too fast...or maybe they just had sucky rear ends?

I had a "cough" 1999 Honda Civic Si "cough" a few years ago, and I don't know what the factory gears were, but at 80mph in 5th, I was turning 4,000 rpm. Still pulled 28mpg.

Thanks again for this great thread!

bigcat · Jan 7, 2008

those little ricers need the RPMs to pull itself along at 80mph. even a Kia Rio turns 3000 rpm at only 60mph. they also redline 7000-9000 rpm depending on the car.

4.10s will put you under 3000 RPM on the highway (80mph)...half of the redline for a GT. were these muscle cars 60s cars? 40 year old rear ends are prone to breakage anyway.

anticubicle · Jan 7, 2008

FYI with 4.10's, cruising on I-95 @ 70MPH I'm @ 2500 RPM

Sparty92 · Jan 8, 2008

anticubicle said:
FYI with 4.10's, cruising on I-95 @ 70MPH I'm @ 2500 RPM

This sounds reasonable to me....a mere 500 rpm over my current setup. I suppose there's no real risk of "overheating" the rear end or anything?

I grabbed this text from the current Shelby Performance Catalog:

HIGH PERFORMANCE RING AND PINION SETS This is one way to improve all around performance, especially oﬀ the line performance on any car whether it is bone stock Mustang or a Supercharged Shelby. Stock Production Mustangs with automatic transmissions have 3.31 Ratio and 5 speeds have 3.55 ratio. 3.73’s are recommended as the best all-around performance gear ratio for drivability. 4.10 generally is not recommended for extended high speed driving. 4.10 gear ratios require a special Carrier Cross Shaft to clear the larger diameter gears.

Again, my car is a total daily driver (yes, even in Michigan winters). I also saw that 3.73s are covered under warranty by Ford (if installed by Ford), but the 4.10s are not (Drag Pak). I also saw an asterisk next to the part number for the 4.10s in the 2008 Ford Motorsport catalog....something about not for sale or use on pollution-controlled vehicles.

I don't plan on having the dealer install these gears, so I'm not really concerned about warranty...the shop is plenty capable.

bigcat · Jan 8, 2008

i have only heard of 4.56 and (numerically) higher gears needing the cross pin.

PUNISHER RACING · Jan 8, 2008

4.56 and higher I have gotten by with the stocker all the way to 4.30's

ranger04 · Jan 12, 2008

No way is 4:10's too much gear for the street, rangers and explorers have 4:10's from the factory behind a V-6 or 4 cylinder. I went with 4:30's and now it feels like a rocket launcher.

steedman07 · Jan 12, 2008

4:10's..75 mph, auto..Im turning 2,600 rpm's..perfect imo...Remeber we are 3,600 lbs. +..We need the gear to get going...

What gears for a 08 GT

DarkFireGT

Playing with my wife's really makes me want one.

nosfed

New Member

stumpjumperpro

New Member

xxrequiemxx

Member

fobra559

At least it's more erect and not floppy anymore.

anthony05gt

Active Member

kooldawg6

mine works really well and can take a fair amount

kooldawg6

mine works really well and can take a fair amount

Sparty92

Member

bigcat

start with the upper hole, and if more traction is

anticubicle

New Member

Sparty92

Member

bigcat

start with the upper hole, and if more traction is

PUNISHER RACING

Active Member

ranger04

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steedman07

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What gears for a 08 GT

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mine works really well and can take a fair amount

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