I have a 01 Fbody M6, and im about to purchase a 9in. I will be running a 28in MT et street, and i was wondering if anyone had a calculator site or somthing that would help me figure out the best gear ratio for my set up. Thanks George .

 

http://www.f-body.org/gears/

 

am i reading this right??? at 6k rpms in 6th gear you "could" do 268mph ??? thats crazy hahaha double overdrive gotta love it

 

I'm a fan of 3.90s on stock rim height. With 28s I would be looking into 4.10s or maybe 56s depending on the setup.

 

what are you expecting to trap? Don't fear the gear.

 

Im thinking at least 125 to 130 and Im going to have 150 shot so maybe 140mph

 

I'd go 3.73's with a 28" tall tire. Bob

 

3.89 or 4.11 with a M6 trans.

Personally if I had a M6 car I wold be driving around with 4.56's but thats just me. LOL, Don't fear the gear!

 

Well I was wondering if anyone had any luck with the 4.56 gears in there cars? But i was talking to someone who had 28inch tire with 4.56 and a M6 and trapped about 142. But he can take his engine up to 8100rpm i think i will be around the 7k range

 

That thing cant be right for automatics considering different stalls and everything else.

 

just so you know.. 140mph is 9sec territory.. and... 4.11s for 26", at least that or 4.56" for 28"

 

does anyone have a 28inch tire out there?? what your gear ratio?

 

What ever will have you trapping at peak power RPMs is what you want to have. The worst is shifting right before the end...

 

I shaved about 3tenths by going from 4.10's to 4.56's with 28" tires. That was for a bolt-on car, the 4.56's made the launch a LOT better.

 

I think im going to go with a 4.86 gear.

 

What is your raceweight?

 

about 3500 to 3600

 

4.30-4.56 would be ideal but it will be cutting it close on the spary