I was thinking of doing a Transgo shift kit in my Mark VIII and was wondering what everyone's thoughts were on this? I've heard they are good and others say they are bad on the 4R70W. I ask because it's either this or the Jmod, and the transgo is a much cheaper option(labor wise) 225.00 for Transgo and Parts vs. 570.00 for Jmod and parts. Wish I had the tools/knowledge to do it myself. Thanks.