Chevy S-10

Where is the modulator valve on a 1987 S10 Chevy Blazer with a 2.8L engine and an automatic transmission?


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2015-07-14 14:59:42
2015-07-14 14:59:42
Where is modulator valve s10Hi there,If your transmission is a stock 1987 s10 2WD or 4x4,the transmission is a 700r4, 4 speed transmission w/ Overdrive.(around 1991 the 700r4, was renamed the 4L60, about 1993 became the 4L60E, E for electronic shift.) This transmission did Not have a vaccuum modulator, as did earlierchevrolet 3sp automatic transmissions.

They use a TV cable (Thottle Valve cable) to determine shifting.The TV cable hooks up to the carburetor or injection body linkage -in a (visual way) similar to the older (kickdown) linkages of 3spd automatic transmissions. It is NOT a Kickdown cable.

Proper adjustment IS CRITICAL to the survival of your 700r4.

you. Good luck


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assuming your talking about the transmission modulator...visually inspect the transmission and look for a vacuum hose from the engine to the tranny...

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No. You can remove the engine and leave the transmission in the vehicle.

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I'm not a mechanic / technician but I believe it can if the automatic transmission uses a modulator valve that has a vacuum line connected to it because the vacuum comes from the engine . If there is a problem with the modulator valve then the transmission fluid could be sucked into the engine

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If your transmission has a vaccume shift modulator, the Engine will suck the transmission fluid out & sometimes if the modulator is real BAD U will have smoke coming out of the exhaust pipe. If this is an automatic, and the car is blowing some white smoke, the diaphragm in the transmission modulator is bad. If this is the case, you will have to replace the whole modulator.

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