Update on post. Jus't got back from tranny shop. This guy was very cooperative and very nice and helpful. Took full responsibility for the problem. Said he thought a small piece of cluth material was left from the 1st rebuild and got into the 3rd gear clutch drum and caused the problem. Said he replaced the 3rd gear cluthces and the reverse clutch pack, put in new shift kit in the valve body and changed fluid and filter, no charge. Couldn't ask for better service than that. Drove the truck home from shop and it shifts better than it did before the 1st rebuild.. If anyone in this area needs tranny service I would certainly recommend this shop. It is Smith Transmission in Athens, AL. Chris Smith is the owner. Customer service like this is hard to find these days. Guess everything worked out for the best. Thanks for all the replies on this thread.