Transmission has failed from 4th gear up (3) times within 91,000 miles. when going at speeds more than 50 miles an hour, the transmission will break and lose forward motion causing a safety issue with oncoming traffic. the transmission was "rebuilt" at lafontaine gmc of highland, mi (2) times and they are telling me they are going to "rebuild" it a 3rd time. just wanted to note safety issue so when this happens in the future i will have a legal avenue.