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    Turbo 400 "Shift Piston" Disconnected?

    Hey there, experts! I'm putting a used TH400 into my 85 Bonus Cab (which is a crap shoot, I know). I took the valve body off, actuated the clutches with compressed air, etc. It seemed promising, so I threw it in the truck. After getting everything hooked up, I fired up the machine and was...
  2. O

    Meaning of "Bonus Cab" in 1985

    Greetings guys, I'm new to the site and to GM in general. I just picked up this clean 85 Bonus Cab dually 3500, and though it has a few problems which I'll post about in a different thread, there's one thing I'm a little confused about. What exactly is a "Bonus Cab?" I've read that it's...

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