I dug out my rear lowering kit for 2morro's shinanigans of completing my drop on my truck and loan behold I found the instructions and the solution for a PIECE DRIVESHAFT VIBRATION! it says:
"...If driveline vibration occurs, with 2 piece driveshafts, install the carrier bearing bracket #CB99 (included with HS25994X) to correct driveline angle..."
So if you are still kinda clueless as to do from here, if u do not have the complete lowering kit for a 2 piece drive shaft truck, call the Tech Line of DJM products at (310) 538-1583. Sorry if I started a new thread and this was already answered but I just thought I would give eveyone some light on the situation. Sorry for it being long, enjoy!

 

Yeah, I put it on my truck, but it was fine without any adjustment, set it to stock and it was fine, this was with a 3/5 kit.

 

u did the carrier bearing and it took care of the vibe?