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Rockstarmx21

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    Big Bend WI

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  • My Truck
    1990 Mack RB688S
  • Interests
    Excavating & Trucking

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  1. Rockstarmx21
    The high low is what messed up I have all my high range gears but I don’t have my low range gears
  2. Rockstarmx21
  3. Rockstarmx21
    Mine has two regulators
  4. Rockstarmx21
  5. Rockstarmx21
    The trans was taken out to be rebuilt and some where while putting it back in the air lines got hooked up wrong
  6. Rockstarmx21
    Dose anyone have an air line diagram for a Mack 12 speed 1070A with deep reduction. Everything works but my low range gears I’m looking for a diagram to make sure my air line are correct
  7. Rockstarmx21
    Rockstarmx21 joined the community
  8. Rockstarmx21
    Can you put a Cat C15 into a 1989 Mack RB688S regardless of the electronics

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