Tonight as I was working on my ruckstell axle which I'm working on for a second time due to rapidly wearing axle shafts I noticed that the ruckstell side axle hosing has a scratch in it from the ring gear. I thought maybe the bronze plate with the big ball bearing on it could be bent so I sat the whole unit in the axle housing and gave it a light spin. The ring gear has a slight bit of run out but, I doubt it's enough to cause the rubbing problem. If I look at the ring gear where the scratch is it's noticeably closer to the axle housing than on the other side. If I rotate the ruckstell unit nothing changes the gaps remain the same. I'm wonder if the axle housing itself is bent. If that's the case the center part of the housing would have to be bent somewhere between the big ball bearing and the bell where the ring gear is rubbing. All the parts are clean and sitting flat without wobble. Maybe the locking plate that the big ball bearing sits on is warped. What do you guys think?
Put a straight edge against the axle tube section and see if it's bent.
Scribe a line around both tires and measure across the lines front, rear, top and bottom. If there is a difference your housing is bent. Also if you have the housing out of the car, rotate the housing and if the wheels wiggle your housing is bent.
When I do a rear axle assembles I always check to see if the housings and axles are bent. The housings I have checked have all been bent some more than others. I have a fixture for my lathe to check them out. Saves time by not having to redo them.