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 & INSTALLATION2-4 SERVO (4L60-E)INSTALLATION

1999 GMC Forward Control 5.7 R, Automatic

2-4 Servo (4L60-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 new seals on the pistons and the servo cover. Lubricate the seals with clean transmission fluid. Install the 2-4 servo assembly into the 2-4 servo bore. Install the servo cover and O-ring seal.
Install the servo cover depressor. See Fig 1 . Tighten the bolt on the servo cover depressor in order to compress the servo cover. Install the servo cover retaining ring. Remove the servo cover depressor from the oil pan flange.
Install the oil pan bolt. Tighten the oil pan bolt to specification. See TORQUE SPECIFICATIONS . Lower the vehicle. Fill transmission with appropriate fluid to proper level. See LUBRICATION .

Fig 1: Installing Servo Cover Compressor To Transmission

Courtesy of GENERAL MOTORS CORP.

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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.