I have a 1995 Ford F-150 4x4 XLT, and I am looking into purchasing a posi for my rear, but I need to know the spline count before i an order. How to I figure this out. This is what my tag on the rear says
S832J
3 31 88 5C13

I assume that the 88 means 8.8" rear, does the 31 mean 31 spline? or is the 31 linked with the other 3 to the left of it meaning that i have 3.31 gears? That is what i originally thought it meant, but since the first 3 is spaced so far away from the 31, I am thinking that maybe they arent connected and that the 31 means 31 spline, can someone help?

 

i'd say so -- when i talked to Ford Parts about this (was looking into getting a different ratio) i was told 4x4 trucks use 31 spline...

28 is probably for cars??

-nt

 

The 3 31 means you have a 3.31 gear in that rear end. The space is for a L, which would make it a limited slip rear end. My rearend has a 3L55 which is a limited slip 3.55, but my friends is just a 3 55.

The trucks have a 31 spline axle, cars use the 28 spline.

 

 

Ok, thanks alot. The helps me out so much because now I know that my truck doesnt have a limited slip because I had heard from a few other sources that it might. Thanks alot.
-John