I have a 1982 GMC K25 (VIN:1GTGK24M7CF714520), however, VIN code does not seem to match the truck. i.e. it is not 4WD and it also seems to be a 1 ton, possibly due to "camper package" per photo below of sticker in glove compartment. It is a dually, and brake parts align with 1 ton, not 3/4...