I had sort of the same problem with a '56 Bel Air hardtop a while ago. Had a whine that was growing louder and couldn't pin it down. Was a well used stocker as opposed to your new one. Took the third member out and looked a the gears and they were perfect. Finally got frustrated and took the whole thing apart. Found the carrier bearings were badly pitted. Replaced them and things were fine. If your gears are true as you say I would suspect the bearings. Can generate a lot of heat in them if they are set up wrong - too tight or too loose, or damaged.
|