Hi i am ordering the gm tech service manuals the light duty ck 1500 2509 3500 and also the diesel supplement manuals from faxonauto literature. i would like to buy a 4l80 e rebuild video as well for when the time comes the older 90s style 4l80e ..n can only seem to find 4l60e rebuild dvds. i know the turbo 400 is very similar but would prefer to have a 4l80e dvd if possible can anyone tell me if and where they sell a good one? thanks in advance