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#1
04-30-2007, 01:35 PM
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TH400 trans question.
Ok, I’ll try to explain this the best I can. 1974 Grand Am , 400, TH400 trans with B&M shift kit. The problem I’m having is the car will shift ok until it warms up. After that, it will shift from 1st to 2nd at 3000 rpm, and 2nd to 3rd at 3400 rpm. Whenever the rpm’s fall below 2500 in 3rd gear, it will drop back down to 2nd even though I’m going 50mph. the vacuum is coming off the manifold and I’ve tried a new modulator. My question is, is this normal or is there something wrong? Is there a way to fix or change this? Any help is appreciated.
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