The rear driver's side lower control arm mounting location is the main obstacle. The 4T65-E HD (when hanging in an SW20) has it's differential where the 2 has it's suspension, which requires moving the mounting point lower by an as yet undetermined distance. At least a few inches. Figuring out how much it would then need to be moved inboard (if at all) to keep proper geometry. We all know the last thing these cars need is to be more twitchy, especially after gaining around 100lbs over the top of the rear wheels. Trax: I'll PM you.