Automatic transmission stuck in 3rd

Discussion in 'Chevy Truck Forum' started by toddatta, Jun 25, 2011.

  1. toddatta

    toddatta New Member

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    I have a 93 chevy k1500. Tranny does not shift unless you shift into low then it will start in 1st. Put it in drive and it seems to be in 3rd.
     
  2. kronhenry

    kronhenry Senior Member

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    sounds like a stuck solenoid in the valvebody throw some z max or lucas tranny treatment in it drive it for a little while and the try the drive gear again if not could be the vss is getting an inaccurate reading and not telling it to shift right
     
  3. NSguy

    NSguy Senior Member

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    I haven't had much luck with running Lucas in the transmission... Try Trans-Medic. It's thin, isn't as viscous as Lucas and works its way into the small stuff easier.
    I'm thinking it's something to do with the VSS. 1993 was the transition year from the 700r4 to the electronic 4L60E transmission. Which one do you have?
     
  4. toddatta

    toddatta New Member

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    Thanks

    Hey thanks for the info. Not sure if ive ever heard of zmax. But have heard of lucas and used it in the engine. Could you please tell me what the VSS means and where it is located
     
  5. toddatta

    toddatta New Member

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    Okay...I will try the trans medic first. But how do you know which tranny it is...meaning 700r4 or 4l60e. And also this may sound dumb , but what is the vss
     
  6. Case 7230

    Case 7230 Senior Member

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    VSS is Vehicle Speed Sensor. It should be on the transfer case tailshaft. It will only matter if you have a 4L60E trans. Look in your glovebox for the transmission code to identify what trans you have.
     

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