Originally Posted by joe_padavano
All 1977-1996 frames and suspension parts interchange. Note that the 77-90 coupes and sedans used the 5 x 4.75" lug bolt circle unless the HD brakes and suspension were installed (usually police and taxi packages), the 91-96 cars used the 5 x 5" pattern on all cars. Control arms are the same, spindles and rear axles swap, springs and sway bars swap.
Good info. I figured there'd be some differences between coupe and sedan so I did not comment.