My friend's dad has a 6.0l out of a 2003 chevy 2500, with a 4l80E transmission, and the engine has 60k on it, and the tranny has a fresh rebuild. he said he was looking for $3-4k for the engine, tranny, and rear end, which Im not sure what rear end came with the 2500's and may not need it. Should I go 4l80E? I plan on putting a cam in it if I get it. Is it worth it to do 4l60E to 4l80E swap, or should I just get a FLT 4l60E? reason is I dont know whats involved in the tranny swap. Do you guys think $2500 is a good price for the engine+tranny? Thanks.