A buddy went to wyotech and the instructors couldn't rebuild a th400 to save their lives! They would rebuild it and install it and it wouldn't work. This happened like 4 times in a row. He called me up and asked me to ship him a th400 our local mechanic/buddy rebuilt and shipped it to him! He got it installed and backed into the shop and lit the 38" tires up, and told the instructor that he's got alot to learn still!