I have had issues with the Front Diff passenger side seal leaking, and as my diff is fabbed out of a Sami rear diff I had a really had a hard time finding the correct seal last time I was in Moab. So I decided to remedy the situation by installing a poly bushing inside of the seal area so axle stub had more to ride on than the seal. I figured that I would make the seal same as stock Tracker this time, which would be a bore of 2.441". Turns out that schedule 40 pipe 2 1/2" is 2.47 inside diameter and outside diameter of a plug cut by a 2 1/2" hole saw is very close to the same. after cleaning up the diff housing I cut the bearing housing out of the diff with torch, then clean it up with a cone grinder. I measured the distance from outside housing to differential gears (when installed), and cut my pipe to fit. I had acquired a piece of high density polyurethane to cut a bushing out of, so first cut it to 3/4" thickness, then cut it with 2 1/2" hole saw, and cut the plug with a 1 3/8" hole saw, and have a bushing to install inside of my seal. After sliding the cleaned up new polyurethane bushing inside my housing bore and slid stub axle into that, (and having third member inside diff housing) I put bearing housing and stub axle into place. As the schedule 40 pipe section was larger than the old bearing housing the gap was close, and it was tacked at several points to hold in place. Remove everything and weld in place. As the polyurethane bushing was just a snug fit, I put several small tack welds towards the back of the new housing bore to keep the bushing from sliding back into differential. Clean up housing and finally drive the bushing into place install gears, check clearances again, install seal and stub axle, and put it back on Tracker.
Running good, and no leaks. Must have some oil on lense of camera.