[rice_classic]

Can I confirm what I think I’m reading?

200 track days in 4 years or 50 per year and you’re changing an axle once every 2 years or 100 track days? If that’s the case, that’s really good, we should all be so lucky because 100 track days on an axle is a level of reliability I think damn near anybody could get behind.

Breather hose - very little of any thing comes out besides hot air and that’s why it’s there solely to keep the boot from ballooning.

Grease - if you’re not running “the good grease” then solve for that but after a year of track days just pull the boot back check the grease and add more if needed or remove and refresh.

The diff fluid is part of the heat equation. Metal conducts heat quite well so if your diff fluid is 250f then so is your axle grease plus whatever other heat is introduced to it or that it generated itself. You can install a greddy doff cover to reduce diff temps and as a byproduct less temp will be transferred into the cv.