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 MANUALSGMC1981VANDURA SPECIAL AUTOMATIC TRANS, TRANS MFR CD 400/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEFUEL DELIVERYROCHESTER MODELS M4MC & M4ME 4-BARRELFRONT VACUUM BREAKSECONDARY CLOSING LINKAGE
1981 GMC Vandura Special Automatic Trans, Trans Mfr CD 400/M40
Secondary Closing Linkage
1981 GMC Vandura Special Automatic Trans, Trans Mfr CD 400/M40SECTION Secondary Closing Linkage
- Engine idle speed must be correctly adjusted. Hold choke valve wide open and make sure fast idle cam follower is off fast idle cam steps. See Fig 1.
- Make sure secondary closing lever is against tang. Measure specified clearance between secondary throttle link and slot in secondary throttle lever.
- Specified clearance is 0.020". To adjust bend tang.
RENDER: 1.0x
NO RELATED
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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.