Go with 3.55 or 3.73. With the 4.10 if you can't rev higher than 5000 or so you're going to be shifting into 5th in the 1/4. (assuming you're going to race at the track as well as street) Not that 5th is nessisarily bad in the 1/4, but there's a point when your gear ratio gets out of hand and I think hitting overdrive doesn't make much sense when trying to accelerate. Anyway, For street I don't think you'd be able to get traction with 4.10 as well as you'd want. Go 3.73 or 3.55!!!

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Michael Black
Quantum Motorsports
Norman, Oklahoma

1988 Merc Cougar 5.0 HO, Ported and Polished E7TEs, 2.25" duals w/ 2 chamber flowmasters, T5 tranny
New E/T!!!
14.626 @ 94.94mph, 2.194 60' time, a little better than last time. Keep in mind this thang is heavy (3590lbs) Finally 14s!!!!

vande97,

The comment was that if the engine makes peak power at 5000 rpms, the car will only be doing 102mph at peak power. You'd need to be hitting 6400 rpms to hit 130 mph in 4th gear with 28" high tires. That's fine if you can make power through that kind of rpm range. Most of our rev limiters will kick in before that.

w/400hp, 4.10's 26" tire, you'll hit 5,000 waaaay waaaaaaay before the finish line in forth

if your serious bout your 5,000 statement, get 3.55's, 5500 get 3.73's, 4.10's will require 6,000rpm motor

my $.02

If you care about gas mileage go with the 3.55's or 3.73's. I was running 3.55's with a stock motor but once I started adding more power with heads cam intake etc. I switched to 4.10's and I love 'em. But it dosen't bother me to only get 17mpg