Changing rear diff fluid to Penrite made no difference. In fact I'd say it's even noisier than it was before when my car turns is wheels.
It supposedly has friction additive premixed in but maybe it's a really low ratio.
Is it a limited slip differential??
Yes. Correct spec fluid and everything too.
I had to get the diff replaced under warranty about 18 months ago due to similar issues.
Might have to get the expensive as unicorn wee Mopar fluid with the separate additive and get it swapped out again.
Dammit I thought I could get away with using non-genuine