I have a 2001 4.3 S-10, and a few weeks ago on a longer trip the rear end started making whining noises when under power and going over 25 mph. The noise went away when coasting. It is not related to engine RPM, just increases in pitch with speed. I took the truck to a mechanic on the road and he said that there was a lot of play in the transmission, and suggested to have someone look inside and suggested the Pinion (that was on the road and he could not help us further). Upon returning I took the truck to a shop, and they also suggested the pinion. they took the diff apart and said that the pinion was bad and replaced it (possible some other gears). However, the whining is still there. Does anybody know where that noise comes from, and what I need to do?
Thanks.
Thanks.