After some very helpful replies in a separate thread, I've decided to focus on the engine/trans at this point and work on the other stuff later. Pretty sure I want a 6.0L swap, but it has to pass CA smog. It seems that the LQ9/4L80E may be the best option b/c that combo came in a light duty truck (Silverado SS). Did the LQ4 come in any 1500 series trucks (not HD)? This is a requirement for the swap. Anybody have any suggestions for shops to do the swap (I'd love to do it myself, but I'm in Japan and need the job completed by my return in July)?