You guys are missing parts of what people are say, slow down and read carefully. You missed what woody9 said about the 8600 lb GRVW and that is what started the confusion over transmissions, as well as what tch777 was pointing out, the difference between the 4L60 and 4L60E. There are no 6 lug SF14B in this body style, they are available in this year range, but only in the trucks-which were already the "new" body style. The over 8600 lb GRVW is one of the ways to get the full-floater.
