K 2500 Truck 4WD V8-379 6.2L DSL VIN C FI (1989)
Fluid Pressure Sensor/Switch: Customer Interest
A/T - Buzzing Noise at Idle
BUZZING NOISE AT IDLE (INSTALL NEW PRESSURE REGULATOR VALVE)
1982-93 C/K, R/V, S/T TRUCKS AND G/M/L VANS WITH 4L60 TRANSMISSIONS
Some 1982-93 vehicles equipped with a HYDRA-MATIC 4L60 transmission may have a buzzing noise coming from the transmission when the vehicle
is at idle. The buzzing noise may be noticed more when the vehicle is in reverse at idle.
The buzzing noise may be a result of pressure regulator valve oscillating due to oil pressure instability at lower idle RPM.