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 MANUALSCHEVROLET1981STEP VAN P30, 5.7L ENG VIN M, STANDARD TRANSREPAIR AND DIAGNOSIS (SINGLE PAGE)DRIVELINES & AXLESDRIVESHAFT & UNIVERSAL JOINTSPROPELLER SHAFT ALIGNMENTADJUSTMENTSPROPELLER SHAFT PHASING (ALL OTHERS)

1981 Chevrolet Step Van P30, 5.7L Eng VIN M, Standard Trans

Propeller Shaft Phasing (All Others)

1981 Chevrolet Step Van P30, 5.7L Eng VIN M, Standard TransSECTION Propeller Shaft Phasing (All Others)

Check that flanges on either end of drive shaft are in same plane. Often there are arrows on slip joint and drive shaft to aid in alignment. If flanges are not in same plane, disassemble universal joint and align.

Fig 1: View Showing Typical Slide Joint Alignment Arrows

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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.