Gearstar 200 4R Overdrive Transmission Install Vacuum Switch
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Worried about lockup on the converter? Gearstar provides this vacuum switch, which is controlled by engine vacuum. It prevents lockup under full throttle and extends it in Fourth gear only at highway speeds. It also disengages lockup prior to a Fourth to Third gear downshift, too. Also, it’s adjustable and can be tuned to your driving style with the supplied Allen wrench. View Related Article
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