Hey folks. I'm in the midst of a 4.0 swap, and while I'm at it I'm replacing the seals on my AX15 & transfer case, as well as swapping over to an external throwout bearing setup.
Anyway, on the bottom of the transmission, on a area that is normally covered by the transmission mounting plate (the 'torque plate'), I found a spot on the aluminum casing that was rotting / corroding away. Once I removed the torque plate I lightly chipped away at the aluminum until I had removed all of the flaking, then wire brushed the spot.
The corroded spot:
This is on the bottom of the AX15. Here you can see it relative to the rest of the transmission and transfer case:
I've never seen aluminum do this before. Any thoughts? How thick is the trans casing at the spot? Anything I should do to stop further corrosion?
Thanks for your time.