Please help me fix this!
Last summer l had a tranny go out so l rebuilt it and slapped he back in and walla. Well it's back to haunt me, after a unsuccessful hunt this morning on my way home going about 20 mph in second gear all of a sudden the rear end lock's up completely on my. l start it up, put it in first and it just dies. So l start it up again and put it in neutral and to my surprise it will run in neutral about 40 mph. l have absolutely no clue and questions and answers are welcomed!