8 3/4 E-Body in an A-Body?

Hey dudes!
Just installed the 8.75. It just fit perfectly even with the 235/60R14 tires (pics on Instagram).
I took the Duster for a testdrive and in 2nd gear it starts making a whining noise. Especially at deceleration.
At low speed it´s quiet.
Anyone dealt with that?
I've ran an e body width axle since ivI' owned my car. No problems. "BUT" I run modern in set 18's off a Dodge Magnum.