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  1. 89_C3500_Larry

    External fuel pump runs with key in accessory position.

    I have a carburated 454 in a 1989 c3500 that originally had a 350tbi. The external fuel pump runs with the key in accessory position. Where should I hook the power so that it only runs with the key in the run position? Any wiring advice?
  2. 89_C3500_Larry

    Th400 transmission cooler for towing

    I have a 1998 c3500, motor swapped from a 350 tbi to a 454 with a demon 600. It's got a th400 with a 4.10 rear gear. The radiator has a built-in transmission cooler. Would it benefit me to add a fan driven external transmission cooler? I'm consistently towing 11,000 fully loaded and my...
  3. 89_C3500_Larry

    1989 c3500 extended cab lift.

    I've found several lift kits for an 89 c3500, but they all claim not to fit an extended cab truck, why is this? And anyone know of a modest lift kit for the 1989 c3500 dually?
  4. 89_C3500_Larry

    1989 c3500 proportioning Valve.

    I need to replace my pv and I'm wondering if this one will work. I'm also seeking any advice on installing said pv and general info on improving brake function as I plan on towing a fifth wheel camper. ACDelco 172-2069 GM Original Equipment Brake Combination Valve...
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