Question about Chevrolet Astro

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Transmission shifts harsh after driving it 10-15 miles

I have a 1999 astro van with 87,000 miles. having harsh shifting after driving it 10 to 15 miles when transmission starts to shift like a hot rod! I pulled the valve body off and replace one gasket it takes 2 gaskets but only had one avalible. Notice the thin plate between the trans and the valve body where the balls seat, the plate had taper wear on it could it be possible the balls are sticking? checked al solenoids with Ohme meter, looked good. a friend said there was a fix by doing something to the valve body! and thats what i need to know?

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  • epigflo May 12, 2009

    I have a code P1870 Trans Component Slipping

  • Corey Morgan May 11, 2010

    are there any codes? (check engine light etc) most rear wheel drive gm transmissions default to maximum line pressure when there is a code set. this is in a hope to avoid a failure, but it makes for a rough ride. let me know on the lights status

  • Anonymous Mar 28, 2014

    harsh shifting

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Alright, since the computer sees the transmission slipping, it maximizes pressure to try and compensate. with the 1870 code it is referring to the lockup clutch in the converter. I have seen colleagues remove the TCC (torque converter clutch) valve from the valve body and insert a stiffer spring to remedy the situation, but i have only seen it work effectively once. It almost always resulted in more problems and headaches wither immediately, or a week down the road.

i know its not what you want to hear, but a rebuild will probably be your best bet. hope this helps.

Posted on May 12, 2009

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