Rear diff chatter?

[dj-t]

Went out for a little spirited driving last weekend. When I went to make a turn and downshift into 2nd I hear and it feels like the rear diff was chattering. It sounded like my exhaust has swung over and was hitting my drive shaft. I didn't just let the clutch go but I gradually let the clutch engage before entering the turn in 2nd gear.

Could it be the rear control arm bushings rattling? I am currently running Redline MT90 for the trans and Redline heavy shockproof for the trans case and rear diff. Any help or suggestions is appreciated.