TR4/4A Rear Axle Oil Leaks Due To Pressurization
written by David Copping
by Phil Allen
To prevent rear axle internal air pressure build-up and subsequent axle shaft and pinion oil seal by-pass/leakage, always clean the air vent "bore-hole" when checking the rear axle oil level.  (vent is located on the right hand upper section of the axle housing adjacent to the rear axle differential cover)