Question about 1986 Chevrolet S-10 Blazer

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1986 blazer s10 auto transmission slips when it changes into 3rd

Ran it for a short time with no t.v.cable could its have damaged anything
it shifts great until it get to 3rd or 4th gear. engine is a 2.8 lt. v6

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  • wstevenmathi Jun 20, 2009

    yes the cable is now installed and adjusted correctly but still doesnt shift right. what part would it break....would it be to complicated to repair or would I need to pull the trans and have it rebuilt??

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Yes, it can damage the transmission. The throttle valve cable controls a modulated pressure - according to throttle opening. A missing or improperly adjusted tv cable results in too low pressure. You didn't state clearly if cable has been installed now. Be sure to install and then make proper adjustment. It should be a self-adjusting cable but they most always need a bit of tweeking as the self-adjust is imo a poor design. Too little space here but you can probably google the adjustment proceedure. Hopefully it wasn't damaged and you'll be OK with proper adjustment. Good luck.

Posted on Jun 19, 2009

  • olwork
    olwork Jun 20, 2009

    it doesn't really "break" a component, but the low modulated pressure at the valve body affects things such as shift timing, quality & overlap. Most notably It will have inability to shift down at the proper speed/load, especially in od, thus placing undue stress on the 3-4 clutch pack. This clutch is particularly susceptible to damage from incorrect adjustment. If that clutch has been damaged, and it likely has, you will need to remove the trans for rebuild.

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