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  1. Classic Cougar Tech
    Does anyone know how to tell how many splines are on an axle? I've got a 67 Cougar with what I believe is an open 3.00 8" diff. I'm just curious because I found a complete 8.8" 31 spline rear diff from a Crown Vic on CList with Posi and 3:23 gearing for 200 and a set of 3:73 gears for 150. It'd...
  2. Classic Cougar Tech
    So I searched but was unable to find a definitive answer. I have a 1970 cougar xr7 302 and want to upgrade the rear end with a limited slip or traction locking differential. My question is, what size is the rear end in my car? and what is the difference between a 28 spline and a 31, and which do...
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