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 MANUALSCHEVROLET2003CHEVY EXPRESS G2500, VAN CARGO EXTENDED, 6.0 UREPAIR AND DIAGNOSISGENERAL INFORMATIONOEM GENERAL INFORMATIONVIBRATION - DRIVETRAINDIAGNOSTIC STARTING POINTCOMPONENT ROTATIONAL SPEED CALCULATIONDRIVELINE ROTATIONAL SPEED CALCULATION
2003 Chevrolet Chevy Express G2500, Van Cargo Extended, 6.0 U
Driveline Rotational Speed Calculation
2003 Chevrolet Chevy Express G2500, Van Cargo Extended, 6.0 USECTION Driveline Rotational Speed Calculation
- Determine the first order rotational speed of the driveline/transmission output shaft/rear axle pinion gear, in revolutions per second (Hz), based on the first-order rotational speed of the tire/wheel assemblies and the drive axle ratio. 13 Hz X 3.42 drive axle ratio = 44.46 Hz, rounded to 44 Hz first-order driveline rotation related.
- Compare the rotational speed of the driveline/transmission output shaft/rear axle pinion gear, at the specific vehicle speed at which the disturbance occurs, to the dominant frequency recorded on the Electronic Vibration Analyzer (EVA) 2 during testing. If the frequencies match, then a first-order disturbance related to the rotation of the driveline/transmission output shaft/rear axle pinion gear, is present.
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.