Hundreds (maybe thousands) have found the differential fill from the factory to be quite low. Mine was about 2 qts low. Factory fill is synthetic "grape juice" and yes it does smell like grape soda. Hope you put the full 4 qts in to bring it to the top. Of course this is assuming you are talking about a G80 differential. A sig would help us help you since we would know what you are driving. Welcome!
A forum community dedicated to Chevrolet and GMC diesel truck owners and enthusiasts. Come join the discussion about duramax engines, performance, builds, modifications, classifieds, troubleshooting, maintenance, and more!