2500ram360motorautomatictransmissionwasrebuilt14,000milesago by a dealerdodgewhen truck is cold and just started up the truck will run for approx.6 to 8 miles transmission does not slip in any gears then all at once i have no gears or truck will not go at all in any gear it goes intro gear but truck will not move when you shut truck off wait about 1minute truck will go again maybe 1half of a mile when truck is cold it will go the futherist any answers on this problem would be appreciated.