He (Dave @ TEP) is one of the most helpful and knowledgeable people I have ever dealt with in the transmission industry. He has spent a LOT of time testing and building and modifying 4t65e transmissions. He is a very valuable resource. Sometimes takes a little while to get back to you via email, but always takes the time to give good, honest answers. He hooked me up with a 700r4 rebuild/upgrade for a trans I was doing for a friends offroad truck. Can't say enough good things about Dave.