Did you check the rear wheel seals? Is a bearing maybe going bad. You must use the 75w140 fully synthetic did you use this last time? When you change the fluid jack up the rear and check every thing. Wiggle the wheels to look for play, check the rear brakes and check the u joints as well maybe check again with the flash light for rubbing. Hope this helps. Matt

 

i used the regular stuff and a mixture of 50/50 lucas heavy duty oil stableizer. did a shake test on the wheels and i didn't get any play the brakes are fine but i haven't checked the u joints yet there is no leaks or anythings tires are only 10 months old and just rotated.....it hasen't come back since the fluid change so i'll wait to see what happens.thnks for your help..