99 when you put it in drive it kills the motor
My dad has a 99 f-250 diesel with about 180000 miles on it. It has been driving fine and shifting good except for the lazy and long drawn out shift between 2nd and 3rd. We put the transgo hd2 valve body kit in the transmission. We did not pull the transmission out we only did the valve body. when we took it for the test drive it acted up one when we first put it in drive it acted like it was direct drive, but was fine after that. He put 150-300 miles on it shifting fine, now when you put it in reverse it sounds like it is making a sucking sound, and every time you put it in drive its like the tc is locked up and if you let it start moving it just starts shifting up through the gears up to 3rd. when you come to a stop it starts jerking and tries to kill the motor. Other than coming to a stop or first putting it in gear it drives and shifts fine when driving. thanks for any help.