AMGauge AG-4906 is a transmission vacuum modulator valve

Description:

🔧 Part Details

• Part Number: AG-4906

• Brand: AMGauge

• Type: Transmission Vacuum Modulator Valve

• Function: Regulates hydraulic pressure in automatic transmissions based on engine vacuum

• Construction: Brass body with reinforced diaphragm

• Connection: Single vacuum port, bolt-on mount

🚗 Fitment Compatibility

This modulator is commonly used in:

• GM rear-wheel-drive vehicles (1970s–1990s)

• Chevrolet Chevette (1980–1987)

• Pontiac T1000 (1985–1986)

• Geo Tracker (1996–1997)

• Chevrolet Tracker (1998–1999)

Also compatible with various TH350, TH400, and TH425 automatic transmissions.

Labor costs for replacement typically range from $120–$240, depending on shop rates and vehicle access.

🔁 Cross-Reference Numbers

⚠️ Common Symptoms of Failure

• Harsh or erratic shifting

• White exhaust smoke

• Poor fuel economy

• Transmission fluid leaks

• Check engine light