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Where is the transmission speed control sensor and what does it look like on a 1992 Chevy Van?


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2005-04-23 16:38:28
2005-04-23 16:38:28

I suppose that it would depend on the transmission used. I have a 1992 G30 (slowly falling apart with 251,000 miles on it) with the 4L-80 E Transmission (heavy duty 4 speed electronically controlled auto). There are two speed sensors, both on the left (driver's)side of the transmission. Both have a two-wire connector. The input speed sensor is located towards the front of the tranny, and the vehicle speed sensor is located towards the back. The input speed sensor measures the transmission's input speed (i.e. the rate that the engine is turning the input to the transmission) while the vehicle speed sensor is used for measuring the vehicles speed (i.e. the rate at which the rear wheels are turning). Its signal is also used for the speedometer - there is no speedometer cable going to the speedometer. Mine is currently busted - transmission won't upshift and speedometer reads 0. Replaced the sensor to no avail. Someone suggested that I check the ignition switch, as part of it might be broken. In general we have had a lot of problems with the electronics on this van, including wiring and connectors failing. Good luck with yours. Richard Rea


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