Question about GMC Sierra 1500

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84 GMC pickup doesn't shift into second until 38 mph. If manually shifted it will shift after 25 mph. What gives?

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Vucuum modulater on the pass side of trans toward the rear. has a vacuum line to it and is round. sounds like your problem.

Posted on Nov 20, 2009

Testimonial: "I'll try it, sounds like it could be the problem. Thanks for your help."

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1 Answer

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