Quote Originally Posted by WickedSix View Post
4L80e was not behind the 6.6 duramax...ever...so I'd question the accuracy of that sight just based on that.... and the 8.1L would only have a 4l80e if it was a suburban, a van, or the 2500 avalanche...in the light trucks and the medium duty trucks it had an allison.... easiest way I know to ID your trans is to crawl under...if its a square pan its a 4L60e if it is a rectangular pan with one rounded corner.. 4L80e
In Express van applications, the duramax was mated with a 4L85E. Power was also dropped to 250hp and 460 ft lbs, opposed to the normal 650ft lbs of the LBZ