C 3500 Truck 2WD V8-379 6.2L DSL VIN J FI (1992)
Transmission Input/Output Speed Sensor: Description and Operation
Turbine Speed
Turbine speed is set to input speed when the transmission is in 1st, 2nd and 3rd. When the transmission shifts into 4th, turbine speed is calculated
by multiplying input speed by a precalibrated value.