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 MANUALSCHEVROLET1985SPORTVAN G20, 6.2 C, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)TRANSMISSIONAUTOMATIC TRANSOVERHAUL - THM 400TRANSMISSION REASSEMBLYCONTROL VALVE SPACER DETENT SOLENOID, & FRONT SERVO
1985 Chevrolet Sportvan G20, 6.2 C, Standard
Control Valve Spacer Detent Solenoid, & Front Servo
1985 Chevrolet Sportvan G20, 6.2 C, StandardSECTION Control Valve Spacer Detent Solenoid, & Front Servo
- Install guide pins into control valve assembly attaching bolt holes. Install 6 check balls into ball seat pockets in case. If transmission is in vehicle, install check balls in pockets of spacer plate. See Fig 1.
- Install control valve spacer plate-to-case gasket. Install control valve spacer plate. Install detent solenoid gasket and detent solenoid assembly. See Fig 2. Connect solenoid lead. DO NOT tighten bolts at this time. Install front servo spring and spring retainer in case.
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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.