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T-350 Vacuum line / 203 drain plug

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by ellero, May 3, 2007.

  1. ellero

    ellero Registered Member

    Jan 25, 2004
    Likes Received:
    Covington, Georgia
    I have an 84 K5 that had a 700r4 and a NP208. I broke them in half and not have installed a 78 T-350 / NP203 with a part time kit.

    The T-350 has a place to connect a vacuum line at the rear but my 700r4 never did because it was computer controlled. Can I connect this into any vacuum line by the carb, or is there a specific place it has to be run too? Also, what is the purpose of the vacuum conection on the T-350? I assume its important or it wouldnt be there. Also it is currently not connected to anything and the truck barley wants to move.

    Next is the NP 203 with the part time kit. Boy was that fun installing without a tranny jack. Does anyone know where the drain plug is on it? I found a filler plug in the rear, but cant find the drain plug anywhere. Please help as I need to get this thing running very soon. I am moving in a month.

  2. gibby2268

    gibby2268 1/2 ton status

    Jun 6, 2006
    Likes Received:
    Middle TN
    The 203 doesn't have a specific drain plug. Looking at it from the rear, take one of the bottom bolts out that hold the round plate on.
    The Th350 vacuum modulator should be hooked to a vacuum port on the intake manifold. The way I understand it, it will shift very harshly if you dont have it hooked up.

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