Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 84 (AUTOMATIC TRANSMISSION SERVICING)REMOVAL & INSTALLATIONPRESSURE REGULATORINSTALLATION

2003 Chevrolet TrailBlazer 4.2 S, 4WD

Pressure Regulator: Installation

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Installation

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, 2002 Chevrolet RV Cutaway, and 2002 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

Install the pressure regulator valve (1). Install the pressure regulator isolator spring (3) and the pressure regulator valve spring (2). See Fig 2 .
Install the reverse boost valve (4) in the reverse boost valve sleeve (5). Install the reverse boost valve (4) and sleeve (5) in the oil pump cover. See Fig 2 .
Compress the reverse boost valve sleeve into the bore of the oil pump to expose the retaining ring slot.
Install the reverse boost valve retaining ring, then slowly release tension on the reverse boost valve sleeve. See Fig 1 . Install the transmission oil filter and oil pan. See DRAINING & REFILLING under LUBRICATION.
Lower the vehicle. Fill transmission with appropriate fluid to proper level. See LUBRICATION .

Fig 1: Installed View Of Pressure Regulator

Courtesy of GENERAL MOTORS CORP.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.