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 MANUALSCHEVROLET1983SPORTVAN G10, 5.7 LREPAIR AND DIAGNOSISTRANSMISSIONAUTOMATIC TRANSOVERHAUL - THM 400TESTINGGOVERNOR CHECK
1983 Chevrolet Sportvan G10, 5.7 L
Governor Check
1983 Chevrolet Sportvan G10, 5.7 LSECTION Governor Check
- Raise vehicle on hoist (rear wheels off ground). Disconnect and plug vacuum line to modulator. Connect pressure gauge to transmission and tachometer to engine.
- Start engine, keep foot off brake pedal, move selector lever to Drive range, and check line pressure at 1000 RPM. Slowly increase engine speed to 3000 RPM and determine if line pressure drop of 10 psi (.7 kg/cm2 ) or more occurs.
- If no pressure drop occurs, inspect governor for stuck valve or weight, or restricted orifice in valve. Ensure governor valve entry and exhaust has .020" (.51 mm) minimum opening.
- Check governor feed system. Check control valve assembly or case screen. Check governor pipe for restrictions and proper fit in case holes. Control valve assembly should be disassembled, cleaned, and inspected if pressure drop of 10 psi (.7 kg/cm2 ) or more occurs (with transmission malfunction).
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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.