[hugger6933]

well as I said I have never seen a 5.3 in a 3/4 ton I have also never seen a 4l60e in a 3/4[ in that body style]. The van gvw's are rated a little different and they did have different motors avaible. I have seen 4.3 v-6's with a 4l80e behind it . One of the moving companys had some built[they have yellowtrucks] it will be easy to determine as all it takes is to look at the motor ,the size is stamped on it on the back and the sides. and no pcm or wiring would have to be changed out to work. In fact you can take out a 4.8 and replace it w/5.3 or 6.0 or vice versa. it won't run perfect I would suggest a reflash but it will go.