I have a stock 95 bronco with 5.8 351 V-8. Just recently i had to replace the cover gasket on the rear diff which was leaking fluid and now I am getting a popping or binding sound when I reverse or turn corners. I thought it was coming from the right front, so this weekend I replaced the bearings on the right front but after closer inspection of the sound I can hear it from the rear end. there is a noticable side to side shimmy in rhythm with the popping sound as I back up. Does this sound like the pinion bearings or maybe just a loose nut on the pinion? Any help would be apreciated.