Ok after I got this engine up and running good my father used it to mow tow rental houses. He said it did fine and then came home unloaded it and was going to mow the grass at home and he said it wouldn't move forward or reverse but the engine was still running good. My friend that helped on the engine said after we got it running yesterday and he drove it around he said it felt like the transmission was slipping? But I drove it around and I couldn't tell anything. It's a mower I didn't know it's transmission could even slip? Anyway is there anything worth checking to see that could cause it not to move forward or reverse? I'm hoping the transmission didn't blow up. That would be a pile of garbage then if it's anything difficult to repair.