1G diff pinion gear preload crush collar

[John norton]

I am hearing a whirring noise only while decelerating at higher speeds. The noise stops when push in the clutch or I accelerate. I suspect that when I had the suspension bushings replaced, the pinion nut was loosened and reduced the preload on the pinion gear. Can I still find a crush collar to preload the pinion gear and if not, any suggestions on how to fix this. Thanks for any help you can provide. (1990 eagle talon tsi awd)