is it possible to use a lift kit off a 78 k20 and put it on 89 k5
It’s aMost likely. Need more details.
So I’d have to shorten the drive shaft?shackle flip is 1/2 ton / 3/4 ton / blazer / suburban specific but the 1ton k30 is its own . so that will swap over for you .
just be aware your pinion angle will need to be set on the short blazer wheel base . and 6" lift kit on short blazer = driveshafts .