I have some mustang friends with them and they hold up well. None of them have broken any parts and one of them ran in 10.30s. They do have problem wearing sliders and synchros pretty bad, none of them are faceplated or pro shifted. They are easy to service. Easier than a T5 for sure. I had one of those time bombs in my stang and never again lol.

FYI the above mentioned tremec trans are the older 3550s and TKOs not the newer style with the straight cut gears.