I know i saw a post some where on this board on how to calculate your rear end ratio by the number of turns the drive shaft has to one turn of the tire.

I just spent an hour searching. sorry to go over old ground.

mine looks like 1 tire to 1.7 on the driveshaft. can this be? im so confused

car is a 86 T/A 305 4bbl vin H, but this is not the origanal rear end.
chuck

 

hope this works
https://www.thirdgen.org/techbb2/sho...highlight=math

https://www.thirdgen.org/techbb2/sho...highlight=math

https://www.thirdgen.org/techbb2/sho...highlight=math

 

thanks for searching for me! I can't beleve I mised the first one, it is the same situation I have. Still when I break ground both tires are spining, I though this ment POSI but up on jack stands when I spin one the other spins in reverse direction.

chuck

 

I had multiple searches going at once

here is a good post about POSI
i do have posi