Gear ratio help

[kieth]

Originally Posted by 61memo

I have 4.11s on my 66 suburban 6 lug I just found a diff with 3.50 is that going to be better?im running a manual 3 speed will be installing a 400 auto in the future thanks

You would be much happier with a 700r4 rather than the 400, send me the following information and I will e mail you a sheet that shows how your truck performs now and how it will perform after the change.

1. engine
2. transmission (3 speed) ratio 1:1 400 auto ratio 1:1 you need a OD
3. rear axle ratio
4. rear tire diameter from ground to top of the tire....

pm me here on the board with your email and I will send it to you. If you are going to be making other changes (engine etc let me know)