96 3/4 ton 4wd, auto tranny, ext-cab, long box. 260,000 kms. previously used to tow a 5th wheel. i'm asuming the tranny is a 4l80. these are turbo 400's with overdrive right? pretty tough? i'm new to diesel motors. what's the equivalent of a compression test for a diesel? it's gonna be nice having a fullsize. (i have a sammy now) i'm guessing about low 20s for mileage. luxury stuff: it's got pw, pl, cd player, chrome grill and bumpers. a/c (which may or may not work, i don't care) is this a sweet truck or a pos? comments welcome. thanks for your help.