trans. When I was calling around for a transmission rebuild for my M/T, 8 of the 10 local shops I called only rebuilt autos. However, it seemed like several of the shops were still familiar with the Z's auto trans because it was used in other vehicles like pathfinder and frontier. The uninstall/reinstall is another story completely though, you'll want to find a good Z shop to take care of it if you're not going to pull it yourself.