 Jim Grant's Tech Tips‘95 Chevy Pick-up, Rear End Whine Q: I replaced all of the rear end’s bearings and gears due to the pinion coming apart on this ‘95 Chevy pick-up with an 8.5 inch ring gear. I’m lost and need to know why it whines on deceleration after 80 mph. - Mark A: As long as you set your bearing pre-loads correctly about the only thing that can cause whine on deceleration would be an incorrect setting of pinion to ring gear. With the replacement gear set there should have been a small container of a compound to be brushed on the teeth of the ring gear to check the heel to toe contact of the gears and the depth of contact as well. Whenever replacement gears are installed in a rear end you must check and adjust as needed the contact area and depth of contact of the gear set. Not following this procedure will most always make for a whining rear end.
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