78 F250 Differential
Senior User
Joined: Feb 2006
Posts: 479
Likes: 0
From: Sonoma, CA
Where is the leak? Mine was weeping from the fill hole. I unplugged the axle vent and changed the fluid with 85/140 gear lube. Cleaned up the cover and used a gasket and no more leaks. Use friction modifier if yours is LS. Mine is not. Some may say this is too heavy an oil for a daily driver but I normally only use the truck for hauling or towing so I wanted the thick stuff.
