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 MECHANICALFUEL SYSTEMROCHESTER MODELS M4MC & M4ME 4-BARRELFRONT VACUUM BREAKSECONDARY OPENING LINKAGE
1981 GMC Vandura Special Automatic Trans, Trans Mfr CD 400/M40
Secondary Opening Linkage
1981 GMC Vandura Special Automatic Trans, Trans Mfr CD 400/M40SECTION Secondary Opening Linkage
- Open primary throttle valves until secondary throttle link just contacts tang on secondary throttle lever. See Fig 1.
- Link should be centered in slot of secondary throttle lever. To adjust, bend tang on secondary throttle lever.
RENDER: 1.0x
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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.