TH350 problems Shifts at 4500+rpms? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

kalbert · 10-02-2013, 05:19 PM

Have you checked for vacuum leaks? Particularly in the vacuum line that connects to the vacuum modulator on the transmission? Without a way to sense engine load the transmission will not shift correctly, and if the engine has a bad vacuum leak it can neither run correctly nor supply the transmission with an accurate indication of load. If it's been driven alot, or driven hard in a poorly running condition or without the modulator connected the transmission will certainly be damaged, possibly severely.

TheBlueBomber · 10-02-2013, 06:32 PM

Quote:

Originally Posted by kalbert

Have you checked for vacuum leaks? Particularly in the vacuum line that connects to the vacuum modulator on the transmission? Without a way to sense engine load the transmission will not shift correctly, and if the engine has a bad vacuum leak it can neither run correctly nor supply the transmission with an accurate indication of load. If it's been driven alot, or driven hard in a poorly running condition or without the modulator connected the transmission will certainly be damaged, possibly severely.

ill check the vacuum leaks.

10-02-2013, 05:19 PM	#1
kalbert Registered User Join Date: Jun 2012 Location: Minnesota Posts: 509	Re: TH350 problems Shifts at 4500+rpms? Have you checked for vacuum leaks? Particularly in the vacuum line that connects to the vacuum modulator on the transmission? Without a way to sense engine load the transmission will not shift correctly, and if the engine has a bad vacuum leak it can neither run correctly nor supply the transmission with an accurate indication of load. If it's been driven alot, or driven hard in a poorly running condition or without the modulator connected the transmission will certainly be damaged, possibly severely.



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