driveshaft banging noise after flip kit install

[Square_78]

Got my flip kit in my 78 c10 today... came down a LOT. wow like 8 inches after i took out a few leafs. I left in 4 leafs plus the overload. Its the summit racing kit with the little red bumpstop. The axel is about 1" from the bumpstop. Anyways, now when i give it light acceleration, theres a bang bang bang that i assume is the driveshaft. U-joint angles? Has anyone else had this problem? If the truck is coasting in gear there is no noise. If you give it gas then BANG BANG BANG. Not good.

Ive read something about the carrier bearing. If the mount adjustable?

Any ideas???
I cant even drive the thing the way it is.