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 MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 180 (AUTOMATIC TRANSMISSION SERVICING)REMOVAL & INSTALLATION2-3 SHIFT SOLENOID VALVEINSTALLATION

1999 GMC Forward Control 5.7 R, Automatic

2-3 Shift Solenoid Valve: Installation

1999 GMC Forward Control 5.7 R, AutomaticSECTION Installation

WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

Install a new "O" ring seal (316) onto the 2-3 shift solenoid valve (315B) if the "O" ring was removed. Install the 2-3 shift solenoid (315B). See Figure . Install the 2-3 shift solenoid valve retainer (314C) into the control valve body (301). Connect the transaxle wiring harness. Install the case side cover. See CASE SIDE COVER .

RENDER: 1.0x

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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.