FWIW different car but my 2016 Challenger had a groan when going around sharp turns, so I drained and refilled the rear with 4 OZ. Lubegard additive and Synthetic 75W-90 oil. Groan went away. That being said, I agree with the others who say the fluid is worn out and/or needs the additive.
Edited by Silverado12 (03/21/18 03:38 AM)
12 Chevy Silverado ext. cab LS, 2WD 4.3 auto
16 Challenger R/T Shaker 5.7 manual B5 blue
07 Harley Dyna Street Bob 96 c.i. 6 sp.
00 Mustang GT auto