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Can I bypass a transmission vacuum modulator on a chevy 350 transmission

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The vacuum modulator is what shifts the transmission if you are looking for harder shifts they, make adjustable modulators. You can bypass it but it will shift erratic I had a shift improved kit installed into my valve body making it shift by pressure but I still ran a adjustable modulator for shift kindness and driveshaft kindness if you get my point. HOPE THIS HELPS

Posted on Dec 31, 2014

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Posted on Jan 02, 2017

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Replace the vacuum modulator valve on the transmission . First off I would test it . You would need to buy a hand held vacuum pump ! and find the vacuum hose at the transmission an test for vacuum there . Do you know what a vacuum modulator valve is ? Google 1980 Chevy Caprice transmission vacuum modulator .

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Please verify the year of your truck. A 2003 Chevy Trailblazer has a 4L60E transmission. This transmission does not have a vacuum modulator valve. The 4L60 uses a vacuum modulator valve but the last year for that transmission was 1992. The perpose of the modulating valve is to control/regulate line pressure. The line pressure in a 4L60E is computer controlled or controlled electrically.

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If its a THM400 the valve should be in the side just above the pan. It would have a vac hose going to it.
If its not a 400 it probably does not use a modulator valve but rather a solenoid inside the transmission.

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There is usually only one vacuum connection on a turbo 350. It connects to the modulator valve on the side of the transmission. This valve uses engine vacuum to determine transmission shift points. The other end usually connects to a direct engine vacuum source. A "direct source" is a hose connection on the throttle body that has a vacuum signal available at idle. If it doesn't, then it's considered a "ported source".I have had some experience with the chevy blazer/gmc jimmy series, both the early large body models and the small body versions. The stalling when put into gear complaint is most likely caused by a bad intake gasket which is common on the older versions with the small block V8 motors. The newer versions with the vortek motors also had allot of trouble with throttle body gaskets. If these problems have not already been addressed, then there's a good chance that it will take care of the problem. Other possible sources of vacuum leaks are the pcv hose that is hard and brittle. Check the hose out carefully, especially the side that normally faces the engine. Check the throttle body bolts (carburetor bolts) for tightness. I hope that this information is helpful to you. Thank you for using Fixya.com.

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1 Answer

Chevy turbo 350 auto transmission


Trans modulator valve to engine manifold vacome. A good source is usualy right behind the carb.

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