gmpp USED to be the best warranty you could buy....when all the buy-outs started happening, we can't get gmpp to pay. so we no longer even work on any cars that have gmpp. you used to be able to just warranty a whole unit (not that i would want a serta anyway) when it had a bunch of carnage in the pan, but now id guess any dealer you take it to that has a competent trans guy will repair the problem....which is not a bad thing.....
Wow, didn't know that. Mine ran up about a year ago so I figured they were still just as good.