after lift noises?

i have a 2001 cherokee sport.
put a 2in BDS. systems lift on it. by a 4x4 shop/
new coils front, AAL long one, in back
4 new BDS longer shocks.
30x9.50 tires.
BDS steering /damper-stablizer.
my problem is at slow speeds , or when going over small
bumps at slow speeds, i get a low rolling rumble sound in back cargo
area ?
shocks are tight, leave springs tight and quite.
had a little rear sway bar kocking from dried bushings, on slow speed even roads. made a low rumble also.
but greased bushings and noise cleared.
but still have the major rumble sound when going over small uneven flat roads or any driveway, road bumps.?

have tried getting under and having buddies, jump in cargo area?
i was under while they did that, and nothing, muffler, didn't hit anything,
shocks made no noises, leafs were quite,
swaybar did make a few creek sounds.
any ideals or similar problems,
only started after the lift.
thanks

check the driveshaft for length and angle.

i did have to put a Trany drop kit on for vibes after lift.
but all is well now.
i think my angle and length is fine.