I have a 2002 toyota tundra v8, 2wd @ 185k miles. Today I decided to check and clean my rear brakes. Passenger side was fine. Driver side drum was coated in gear lube. The leak must be small as the differential fluid level was fine and the fluid never made it out of the drum to the wheel/tire. The shoes will have to be replaced. I have read that when the axle seal develops a small leak (ie not blown) then the likely culprit is the wheel bearing starting to go out. Is this true with tundras? Does the wheel bearing need to be replaced now that fluid as gone through it? Advice?