Im gonna have a 5 lug rear disc 8.8 rear installed in my 83i finally got it. It came complete with mac lowers from junk yard. Im wondering what uppers do i use or do i just keep em stock what about springs if they are coming off should i upgrade rear springs while there. thx:SNSign:
Being an 83 model, replace with the FMS unless you want to stiffen the riden a little more. My experience is that the lower control arms offer more than the uppers for a daily driver.