Two days ago started noticing a chirping sound coming from the back of the car when shifting from 1st to 2nd, usually shifting around 3k, and there's no way I'm spinning my rear wheels. I then heard the same sound after hitting a bump on the road. I'm assuming it's one of the bushing going bad back on the rear diff, or do diffs make that sound if somethings wrong with them? Won't be able to check out the car til the week so just looking for a little input in the mean time.

 

Bump...

 

Noone's ever experienced this before?