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 219 (AUTOMATIC TRANSMISSION SERVICING)REMOVAL & INSTALLATIONCONTROL & SHIFT SOLENOIDSINSTALLATION
1999 GMC Forward Control 5.7 R, Automatic
Control & Shift Solenoids: Installation
1999 GMC Forward Control 5.7 R, AutomaticSECTION Installation
WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
- Install the 3-2 control solenoid. Install the 3-2 control solenoid retainer. See Figure.
- Install the 1-2 and 2-3 shift solenoids. Install the 1-2 and 2-3 shift solenoid retainers. See Figure.
- Install the pressure control solenoid. Ensure the electrical tabs are facing outboard.
- Install the pressure control solenoid retainer and retaining bolt. Tighten the pressure control solenoid retaining bolt to specification. See TORQUE SPECIFICATIONS .
- Connect the internal wiring harness electrical connectors to the following components:
- Transmission fluid pressure switch (1). See Figure.
- 1-2 shift control solenoid (2).
- 2-3 shift control solenoid (3).
- Pressure control solenoid (4).
- TCC PWM solenoid (5).
- 3-2 control solenoid (6).
- Install the 1-2 accumulator. See ACCUMULATOR ASSEMBLY .
- Install the transmission oil pan and filter. See DRAINING & REFILLING under LUBRICATION.
- Fill transmission with appropriate fluid to proper level. See LUBRICATION .
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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.