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  1. N

    Questions about JB7 Brakes

    Great, thanks for the reply and information. It looks like according to that brake chart my truck may have been ordered with JB7 and the 6800lb GVWR. I really appreciate the help!
  2. N

    Questions about JB7 Brakes

    Hey everyone, longtime “guest” reader here and I have learned so much from here, so thanks for having an awesome forum. I have a 1979 K20 with a 400sbc, TH400, NP203 that I am working on. Unfortunately the SPID is missing, I’m in the process of ordering an RPO list for the truck. The truck...

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