On my two differentials the bolt holes that hold the differential to the housing and the rear cover extend into the inside environment. It is common to see lock washers on these bolts and they do not seal. However the hypoid fluid is pretty thick.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!