Question about 1983 GMC C1500

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350t chevy tranny hisses when I let of throttle when it's cold. it's in a 1978 chevy blazer with a 350 engine

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Check fluid level when hot. If ok the flush cooling lines between tranny and radiator. Also check your modulator they are cheep from napa. Difficult for me to duplicate hissing sound on the computer but check your converter for how hot it is after twenty minutes. Last check the vacume line from manifold to modulator..sometimes a small hole can make that noise and effect shifting...hope this helps:)

Posted on Sep 08, 2009

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