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Truck won't shift right

Discussion in 'Trucks and Trailers' started by Qicchev77, Apr 23, 2000.

  1. Qicchev77

    Qicchev77 LawnSite Member
    from Montana
    Messages: 10

    I have a '77 k20 with a turbo 350 tranny in it. My problem is that whenever it is in drive, 1st gear will go to about 2000 rpm then it will shift into second and about 50 rpm after that it will shift into third and lug the motor. My transmission has enough fluid. Any suggestions why this might be doing that?
  2. Alan

    Alan Member
    Messages: 1,185

    Modulator, maybe? I'm not real familiar with what it does, but I know if the vacuum line is unhooked funny things happen to the shifting. This is the small cannister looking thing on the right side of the tranny with a vacuum hose to the manifold.

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