99 Dodge pickup. Just did a complete transmission rebuilt and new torque converter because reverse went out. After completion, the transmission would shift into second then try to downshift into first. I replaced the speed sensor (codes were showing up) and the govenor selonoid. Test drove and worked fine. Then tried backing up later and was slipping in reverse. Removed the pan and then readjusted the reverse servo. Test drove and worked fine in reverse but now is doing the same thing with trying to downshift to first when going into second. Any ideas? I am at a loss.