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Posted on Jan 02, 2009
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''88 chevy K2500 won't shift past 2nd gear

Where is the vacuum modulator located

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  • Posted on Apr 29, 2009
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Can also be a broken governor gear

  • Anonymous 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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  • Posted on Feb 12, 2009
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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.

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  • Posted on Jan 02, 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

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My truck wont shift out of 2nd gear. was pointed to the ignition switch the truck will start but the yellow wire to the switch has no juice in either position. Would this put the truck into limp mode?

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