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Sorry to bring this thread back from the dead but I just got my 4.8is back from the dealer today. They reprogrammed and updated all of the software. So far I am still having the same issues as described in the SIB. I drove right back and took the SA around the block to show him and he reluctantly agreed with me. So I will be taking it back in next week for further diagnosis. Will follow up with the findings...
My guess is an internal problem with the transmission, possibly the torque converter going bad.
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