Auto trans ratios

[DavidB]

Searched a bit, no immediate luck. Anyone have the ratios for the various GM autos handy?

I have an 88 K5 (sig) with a 700r4 that sees time in rocks, dirt, and sand. 1st is too low, and 2nd is too high for sand. My brother's truck is 4.56 with 39" tires and a th350, seems to work well, but the extra beef of a 400 would be nice, depending on ratios. ratios/input?

Thanks - David

 

[grimjaw]

Try here

 

[bear76]

http://www.florida4x4.com/tech/gearcalc.php

 

[DavidB]

Thanks...looks like 400 and 350 ratios are pretty close. I thought I'd heard that the 400 had wierd gear spacing, and robbed more power...?