Thank you for the response. Less than 50-100 miles on the current gears. Had them installed not long ago. So I guess having the mesh pattern checked is the next step ?
Would a bad pinion angle do anything like this ? Ie, make the whirring type noise on deceleration?
70 Challenger. Dana 60. 4:10s. Less than a year old. No issues accelerating at cruise or laying into it. Hear and feel a metallic whirring sensation/Sound on deceleration as you come off the gas.
From what I have researched the concern might be a pinion bearing failure or poor pinion bearing...