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 MANUALSPONTIAC1983J2000/SUNBIRD L4-121 2.0LREPAIR AND DIAGNOSISTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSA/T - 125C IMPROVEMENT OF TCC APPLY WHEN COLD
1983 Pontiac J2000/Sunbird L4-121 2.0L
A/T - 125C Improvement of TCC Apply When Cold
1983 Pontiac J2000/Sunbird L4-121 2.0LSECTION A/T - 125C Improvement of TCC Apply When Cold
TSB 85-27
Subject: 125C
Some complaints have been received, that when the TCC exhaust hole has been enlarged to .080 to .125 inches, the converter clutch applies very hard, when the transmission is cold. Enlargement of the hole is done to reduce converter clutch shudder.
To improve the cold apply feel of the converter clutch, and to help prevent the shudder when hot, drill the exhaust hole to .070 inches, and cut a notch as shown in the gasket between the separator plate and the valve body.
This gasket slot will act as a temperature sensitive orifice and will give a smoother cold apply, and still help to eliminate converter clutch shudder hot.
Subject: 125C
Some complaints have been received, that when the TCC exhaust hole has been enlarged to .080 to .125 inches, the converter clutch applies very hard, when the transmission is cold. Enlargement of the hole is done to reduce converter clutch shudder.
To improve the cold apply feel of the converter clutch, and to help prevent the shudder when hot, drill the exhaust hole to .070 inches, and cut a notch as shown in the gasket between the separator plate and the valve body.
This gasket slot will act as a temperature sensitive orifice and will give a smoother cold apply, and still help to eliminate converter clutch shudder hot.
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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.