do it. the breakdown by years is as follows. 72-75, 76-80, 81-85, 86-90, 91-93. look at lmc web site for stuff you may need. i just took a 91 long bed, cut fram to short bed, installed the 318 tbi w/518 od trans. used and 87 cab. re used pass door from 91. changed drivers door from manual to power everything. core supports are diff on 91-93. but you can use almost everything, one way or another. it get a little hairy when you use an overdrive with a 30 gal gas tank. if you have specific questions, pm me here. my son and i have approx 15 trucks.