ummmmmmm-
the power trax is made for non posi cars, all you do is bolt it in place-
if you are planning on replacing clutches, then im guessing you already have a posi rear-
my buddy joe and i did this to his non posi gn , about 3-4 years ago, and the power trax started out making the normal ratcheting noise when you turned a corner,... then after about 5k the car didnt make the noise anymore--
the power trax works great- and well worth the $$ to do-