Thumping Noise In Rear After Sway Bar Install

[andrecat112]

i just got my sway bar (whiteline sway bar) installed this past thursday (new endlinks, and bushings). now when i go over small bumps i hear this loud thump coming from the rear passenger side. any ideas?

could it be a bad rear shock absorber?

[andrecat112]

ive seen posts saying it could be the busings, but if the bushings are completely new, why would it be the bushings being faulty?