MY buddys got a rolled k5 that im thinking about pulling the lift nad tires off of for my truck. Its an 88-91 k5. i was looking on roughcountrys web site to figure out just how much lift it has and it says that the 88-91 is diff than the 77-87 use diff lifts? is it true? ive got an 84 what would it take to make this lift work?