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hey everybody. i have a 68 mercury cougar XR7 with a 302 2V engine. everything is pretty much stock to my knowledge, but i want to put positraction in the rear end. one of my questions is, what type of rearend did the 68 cougar have back then? should i replace my rear end before i decide to put posi traction in? also, what kind of positraction units are the best? just for street use. thanks guys:1zhelp: :1zhelp: