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I have a 2003 v8 started shifting harsh into 3rd gear an almost seemed like it was slipping into 4th no codes t all had the trans rebuilt and then had the computer updated with all the newest updates an it still is shifting hard in to 3rd we can't figure out the problem... Any suggestions

New to the site found a lot of helpful info on here but have my own problem now and hoping to find some help. Today I went on a two hr road trip and when I arrived we stopped and got something to eat. When I started the car to leave it was idling rough then put it in reverse and it stalled then...