Question about 1988 Chevrolet K2500

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''88 chevy K2500 won't shift past 2nd gear

Where is the vacuum modulator located

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Can also be a broken governor gear

Posted on Apr 29, 2009

  • rad74 Apr 29, 2009

    Sorry about the first answer i had submitted. I didn't pay attention to the complaint good enough the first time around. It sounds to me like you could have an internal problem such as a broken sun shell which is real common in that transmission. Could also be that your forward clutches are burned up.

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The 1988 K2500 does not use a vacuum modulator. You only have a throttle valve cable (TV cable) wich is located on the left side of the transmission. the cable goes to the throttle linkage. If incorrectly adjusted or broken the transmission wont shift up/ skid.

Posted on Feb 12, 2009

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Tha vacuum modulator will not keep the truck from shifting,it only helps with sift quallity.it sound like you have some internal problems and will need to take it to a transmission shop

Posted on Jan 02, 2009

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