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Perhaps the driver of this 1990 Tracker is referring to the speed in which the torque converter cluch (TCC) blocks up. My 1991 Tracker's TCC is designed to lock-up at 40MPH. This is accomplished by the governor pressure (which is determined by road speed). The TCC relay is under the hood and it sends the signal to the governor pressure switch. When the governor switch closes it energizes the lock-up solenoid valve,which pressurizes the TCC mechanism causing lock-up, which could be mistaken for another shift by some.

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Q: How can you adjust the the speed at which shifting occurs of an automatic in a 1990 tracker It has a 1.6L engine?
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