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Q: y is there a loud noise on decel after replacing r&p on 1991 GMC Vandura 2500

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Hello everyone im new here but need help.i replaced ring and pinioin bearings, worm gears and side bearings, had to replace drive shaft had aluminum now has steel, i replaced because of chipped pinion shaft teeth and bearing,now i have a lound whining noise on deceleration was not there before can some one tell me where i went wrong. or some suggestions. please
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could also be the torque on the pinion nut. make sure that the torque is correct and by the way, did you use a new crush collar or use the old one??

The gear mesh between the ring and pinion gear is wrong. Let someplace that does this kind of work adjust them.
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