Rinker

After reading for some time here, I thought I would start a thread on interchangeable mod parts for all years. You name the part swap and the year vehicles involved. I'm thinking things like seats, delay wiper, exhaust /intake manifolds, heads, gears, transfer cases, body parts etc. You get the picture. After naming the years involved and the parts you swapped, tell if it was a no modification change out (dropped right in), or if some minor mods had to be made to make it work. Tell why you did it and if there was any gains over the original part.