This is my first thread started here on this forum and I hope that by opening this discussion we can have more people contribute to this analysis with a critical eye the next time they have to dig into the rear axle. I believe I have found why Tacoma and 4runner axle seals continually leak. Some would say I am overthinking this. I look at this as a common and incredibly expensive repair for most owners of these trucks. So let me start by saying this. The seal does not properly sit on the retainer. There is no way to get the seal to correctly sit on the retainer.

*I can't seem to figure out the right way to post pictures here, so Here is a link to the topic.

Possible solution to leaking axle seals - redirect --> --> -->