O.K., I just replaced the second extention housing on my 4L60E. It still cracked even with the torque arm relocated. Chris at CK Performance built the unit and replaced both housings. In talking with him today at his shop, we were trying to come up with a solution to the cracking problem. We decided that billet is the way to go. He has some real nice cnc equipment and said that if there's some interest, he would produce it. My father is a methods engineer and said he would strengthen the design and write the program for Chris. Would anyone be interested in a product like this? Just trying to gague potential interest.