Chris's46/515 Have found it is best to not fill the differential chock full-running over put the plug in !!! If you do that it puts more oil out there than the seal likes to handle. Especially in hot weatherand on a long trip. I think the service book says OK to be 1/2 inch below the plug hole cold and level,then can expand some. When you drive and get not level both ways the hubs fill their pocket and lube bearings and seasls.
