[GMC70c20]

this summer I'm gonna put a 12 bolt rear end out of a 72 camaro in my truck. I was going to flip the axle, that should lower it about 5 in. but that's a little lower than I want to go is there anyhing I could do to lower it about 3 to 4 inches with still using my leaf springs? the truck is a 3/4 ton with a dana-60 with the stock leafs and shackles.