I have a 3/8" hole in the passenger side of my rear axle housing. What's up with that? I saw a reference in an old thread that mentioned a freeze plug for that hole. I've not found another reference to it yet. I'll have to look agin tomorrow to see if it's on the top or bottom of the housing.
I've heard of people adding a hole in the tube to drain away rear axle oil before it can get to the outer bearing and brakes. The idea of somehow fitting a freeze plug to that is new to me.
Stan Howe used to put a drain hole in the Ruckstells he built. It had a hole with a 3/8" pipe thread on the right side rear axle housing towards the bottom. I've done this myself and like the convenience of easily draining the rear axle oil.
Late model rear axle housings have a breather hose on the top of the axle tube. Any chance someone added one to a model T axle housing. Would the be beneficial to a model T to relieve pressure?
Saw a T Speedster at the Newport,Indiana Antique Auto Hill Climb last year that had the differential housing drilled and breather\vent tube installed.