So Im thinking of replacing my 73 K20 longbed with a TBI powered K5. I kinda miss my 81 but also want overdrive and fuel injection. Im wanting to go with a 2" Tuff Country lift cuz its a softer spring than my current 4" ROUGH Country. But Ive seen some lift kits list a different part number for the 88-91 K5's. I thought all the 73-91 K5's had the same suspension. My plans are to do the intake/exhaust mods to the TBI motor, throw on a 2" lift, swap over the 3/4 ton axles with 4.10 gears and locker and roll with my almost new 35x12.5 BFG M/T's.