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Where is the modulator valve located on the transmission of a 1993 GMC Sierra?

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Will be to the back of your transmission, on the side, will have a vacuum hose going to it.

Posted on Dec 11, 2010

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How do i replace transmission modulator valve on a 1991 gmc sierra 1500 4.3


UNLESS you have a TH400 3 speed HD automatic transmission, which I HIGHLY doubt being it's a 1500 with a 4.3, you won't have a vacuum modulator. UNLESS someone swapped an older TH350 or TH400 transmission into the truck.

Instead you'll have what called a TV cable, or throttled valve cable.

This cable should be located on the passenger side of the transmission and is routed up to the side of the throttle body and hooked up like the old "kick down" cables.

The TV cable isn't simply a "kick down" cable, even though it does act like one, it also adjusts the pressure for the transmission to shift at different throttle positions. Much like the old vacuum modulators did.

Hope this helps.

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Location modulator valve


700R4 TRANSMISSION DONT HAVE ONE BUT THE THM350 400 AND 475 TRANSMISSION S MODULATOR VALVE LOCATED REAR BACK BOTTOM CASE ABOVE OIL PAN ON TRANSMISSION CASE.

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I have a GMC Sierra 4x4 and can't get the transmission to shift out of first gear. What could it be?


There is a modulator valve on transmission that has a vacuum line attached to it that may be bad or a broken vacuum line.

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Shift module? Are you talking about a control for the transmission? The Engine computer controls the transmission. What kind of problem do you have? I can likely help.

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It is located on the transmission with a vaccume line going to it. There is a clamp with a bolt that holds it to the transmission. It is an easy fix.

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