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  1. C

    Front posi-traction differential

    I still have a limited slip in my front diff. Seemed to work off-road pretty well but it got scary real quick when I tried it on snow packed pavement. The truck jerked left and right and I had to stop to unlock the hubs. I suspect posi would have been more manageable and open diff would have...
  2. C

    High idle help after replacing fuel pumps, 1988 K30, Original, TBI, 454.

    Another thing to consider is the tbi fuel pressure regulator might be starting to fail. New pumps may have been enough to cause symptoms. it’s a long shot and less likely than other things but if the tbi is original and the regulator has never been replaced it should be checked if other trouble...
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    Engine Speed Switch Delete

    I thought I read that the speed switch worked with the A.I.R. system. I’ll try to find it again. Update: the speed switch is part of the TRC (throttle return control) system. My manual said it should tell the throttle actuator arm to extend above 1890rpm (might not remember that number...
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    Limited slip in the front?

    I installed a limited slip in the front of my 81 K20 and have only tried it once in the snow on a highway near Mt Hood. It was scary to drive over about 30mph. I unlocked the hubs and put the truck back into 2hi. Was able to drive without it trying jerk the front left or right after that. If the...
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    1983 K20 350 SBC Upgrade Opinions

    My 81 K20 350sb/th400/np208 with 4” lift & 33”x12” tires slowed down if it even saw a hill coming. And, 7.5 mpg. I swapped in a 1973 454 with 9:1 compression and an rv cam and that made it drive and feel like I thought it was meant to. Plus, new mpg was 10 with a camper. Huge improvement...

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