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I have a 1999 GMC 2500 4X4 with a 6.0 and a 4L80E. A few years ago I had the 4L80E rebuilt by a pretty reputable local shade tree mechanic. He came highly recommended. Anyways ever since I've put the transmission back in the truck it doesn't feel like it shifts right? It also feels like it...

I loaned my 1999 GMC 2500 with a 6.0 and a 4L80e to a friend. It was working fine. He brought it back and said that reverse just stopped working? Today I've tried everything, checked the fluid, disconnected the battery for a few hours, drove it around the sub-division, come home nada, no...