When I looked into getting a remanufactured tranny for a 4.8, getting one through the dealer was not that much more expensive than from a local tranny shop. The installation labor was also only slightly higher than the local shop. So, if I were to go remanufactured, I would go through the dealer.

If you can't find a place that you have confidence to locally rebuild your tranny then you have no choice I guess.

IIRC I thought it was 2 year warranty with the dealer and 3 year with the local. Maybe I mixed it up.

Also, I think the main difference between rebuilt vs reman is that reman are tested for a certain period before it goes out. I guess most shops can't test your rebuilt tranny until AFTER its been reinstalled already on your vechicle.