518 transmission not shifting
I have a Ram van with a 518 and I had a guy come and rebuild it. After he was done everything seemed ok at first then it would not come out of first gear. So know if you let it sit for a while you can go two blocks and everything is fine then it just starts getting worse and worse then all you have is first gear and reverse and nothing else. It doesnt slip it just will not shift after a couple of blocks. Any help would be appreciated !!!!!