wanderlodge

I have a 1966 gto with a LS-1 and T56 my rear end is a little high for the t56 what do other people recommend

cbrodine

need more info

what rear end and gears do you have now?

gofastwclass

iTrader: (2)

To add to what cbrodine said, you will need the tire height and RPM you want at a given speed. The best thing to do is figure out what wheels and tires you are going to run, your driving style and purpose, then throw it all in a gear calculator and determine what works best for your needs. If you are going for cross country cruises the ratio will differ from a street / strip drag car which will differ from an autocross car which will differ from a T-Bucket... you get the idea.

Summit is one place that has a gear calculator that allows you to chose what you have and solve for what you don't.

garys 68

iTrader: (1)

If you're running fairly standard tire sizes, you might start with what was behind the factory LS1/T56. Gm put gears around 3.42-3.7. Your car weighs a bit more, so between 3.7-4.11.

1964SS

iTrader: (1)

I'm running an LS1 with a T56 in my 1964 chevelle. I have a 31" tall tire with 4.11 gears and it's a nice setup. With a shorter tire it would be even better actually. Right now I'm doing about 75mph at 1600 rpm in 6th.

bczee

iTrader: (12)

I would suggest mid 3.x to high 3.90.. that should be a good all round great set with most common tire sizes. It should get you some good MPG..

What rear end housing to you have ?

I have 4.11's w/275-40-17 and get 26mph, runs high 13's and do well in Autocross.