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Shift kit..

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by rcpilot, Mar 27, 2002.

  1. rcpilot

    rcpilot 1/2 ton status

    Feb 22, 2002
    Likes Received:
    Central Cali
    Previous owner had a shift kit, he doesn't know which kit, installed when the tranny was rebuilt.. problem.. it shifts way too quick, especially into 3rd.. I was going to install an adjustable vacuum modulator (Kragen $16.99) on it.. would that be the best way to delay or can portions(which portion) of the shift kit be removed from the valve body to eliminate this problem.. or do I need to swap out the valve body.. Thanks..
  2. dyeager535

    dyeager535 1 ton status Premium Member

    Dec 13, 2000
    Likes Received:
    Roy WA
    In my experience with a TH400, = or- 5MPH was all I could manage to delay shifts with an adjustable modulator. The correct way to change the shift points is to modify the governor, and there ARE kits available for this.

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