What would cause the transmission on a 1992 New Yorker to jump into passing gear without stepping on the accelerator?
It sounds like your torque converter is jumping out of lock up mode. It seems the transmission is reading the pressure incorrectly and thinkingit needs to drop out of torque converter lockup in overdrive and drop down to the next gear. I am not sure if your tranny is regulated by vacuum or by electronics. In the old days they were controlled via vacuum modulators by new ones are electronically driven to match gears to rpms and ground speed.
When you press the accelerator, the engine wants to tach up right then and there... in the current gear the car is traveling in, it may not be possible without bogging the engine down, so the transmission is shifted down in order to accommodate the demand for increased RPMs while preventing the engine from bogging.
When another vehicle is passing you, safe practice suggests that you: * Back off on your accelerator so as to slightly slow down allowing the passing vehicle to complete the pass as easily, quickly, and therefore safely, as possible. * Concentrate on keeping your vehicle steadily within in your lane of travel, without any weaving, which could panic the passing driver. possibly resulting in a collision. * For maximum safety for you, the passing vehicle…