28 or 31 spline rear end?
1988 F150 XLT LARIAT 2WD
Axle Code 18 - Ford 8.8 - 3.08 gears
From what I've read only the mustangs had a 28 spline and pretty much everything else had a 31. But I need to know which one mine is and if that's correct. Looking to get a locker for the rear, tired of the one tire fire.
All the pickup differentials came with 31 spline axles.
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