Can I switch my 6" coils for 4.5"?
 

I have a 6" revtek lift on my truck (see sig). I am wanting to drop to a 4.5" to stay with 35's when these 37's wear out. Can I just change the coils and keep everything else with the lift? Only problem I can for see is adjusting the pinion angle on the front, and I think I can still adjust it enough even with the 4.5" coils. The rear will be fine because it has a 4" block and the rear springs have sagged some from years of hauling stuff so it should make it close enough to level with the front. Right now the front sits higher than the rear.

i think you will have no problems putting in the 4.5 " coils.
my buddy put in a 4.5 kit in his 05 truck, it was a pro comp kit, he hated it so much after 2 week he put it back to stock. problem was he wrecked 2 of the factory control arms, i didn't think it was going to work, but he left the 4.5" lift control arms in the truck. no problems, and it still went to alingment shop.with the 2" spcer kits, nothing really gets changed, you will be fine, probably look better too having a slight rake to it like factory.