vibration accelerating after lift kit

[aggiedave98]

I just finished my fabtech 3" lift kit on my '89 suburban 1/2ton 2wd. On the rear I have 2" lifted leaf springs (although it lifted it more than 2" compared to the old springs).

When I accelerate from a standstill, I feel a vibration it seems like from the wheels. It's almost like the wheels are hopping on the pavement. Could this be the drive shaft vibrating because the angle of the 2nd half of the drive shaft between the crossmember and the differential is too sharp??

Thanks!!