1987 - 1996 F150 & Larger F-Series Trucks1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks
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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
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?
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.
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