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  1. 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...
  2. High Performance
    Hey guys, I'm new to the site and have had a very nice '68 for about 6 years now. It started as a father son project, but now we have a lil bet going on. The point is I plan on upgrading the rear end to a 9in and wanted to know if anyone had experience or helpful tips in a good set-up for a...
  3. Classic Cougar Tech
    hi there, i have the stock rear end in my 68 xr7, 351c engine. im looking to get a new one, id like more power but id also like to do longer drives with it like 100+ KMs so which gearing will give me the most power while keeping the rpms low enough on the highway for comfortable driving? thanks
1-3 of 3 Results