Well the rear main seal on my dads truck, 93 cummins, started leaking really bad so we pulled the tranny out etc, anyways while we were in there we put a new clutch in, with 230,000 miles it was probably due, so we put a 94 clutch in which was $200 cheaper. This clutch is not only cheaper but also lighter so it revs faster, probably get better fuel milage among other things. But we didn't have to do any modifications or anything, it just bolted right in, just thought I would let you guys know.