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 66 (AUTOMATIC TRANSMISSION SERVICING)REMOVAL & INSTALLATIONCONTROL VALVE BODY (4L80-E)INSTALLATION
1999 GMC Forward Control 5.7 R, Automatic
Control Valve Body (4L80-E): Installation
1999 GMC Forward Control 5.7 R, AutomaticSECTION 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 8 checkballs (9 checkballs for some transmissions) into the control valve body. The checkball marked as No. 2, is used on RCP, RDP, ZJP and ZLP models only. See Fig 4 .
- To hold the checkballs in place, use assembly lubricant. Install the PWM screen into the control valve body.
- Install the manual valve (16) into the control valve body. Install the control valve body gasket. Install the control valve body assembly. See Fig 3 .
- Attach the manual valve to the detent lever while installing the control valve body assembly. Install the transmission fluid pressure manual valve position switch.
- Install the transmission fluid pressure manual valve position switch bolts finger tight. Tighten the bolts sequentially to specification. See Fig 1 and TORQUE SPECIFICATIONS .
- Install the manual shaft detent roller and spring assembly (3) and bolts (2 and 4). Install the 2 wiring harness clips (1) and bolts (2). Install the wiring harness clip (1) and bolts (2). Install the lube oil pipe (5) with the short end into the control valve body. Install the lube oil pipe retainer (7) and the bolt (6). See Fig 2 .
- Install the remaining control valve body bolts and tighten the bolts sequentially to specification. See TORQUE SPECIFICATIONS .
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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.