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 MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 483 (VIBRATION SYMPTOMS DIAGNOSIS AND CORRECTION)
1999 GMC Forward Control 5.7 R, Automatic
Section 483 (Vibration Symptoms Diagnosis And Correction)
1999 GMC Forward Control 5.7 R, AutomaticSECTION Section 483 (Vibration Symptoms Diagnosis And Correction)
WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
- Specifications
- Diagnostic Information and Procedures
- Brake Rotor/Drum Balance Inspection
- Component Rotational Speed Calculation
- Diagnostic Starting Point - Vibration Diagnosis and Correction
- Driveline Working Angles Measurement
- Engine Order Classification
- Hub/Axle Flange and Wheel Stud Runout Inspection
- Pinion Flange Runout Measurement (Non-System Balanced Flange)
- Pinion Flange Runout Measurement (System Balanced Flange)
- Propeller Shaft Phasing Inspection
- Propeller Shaft Runout Measurement (One-Piece)
- Propeller Shaft Runout Measurement (Two-Piece)
- Symptoms - Vibration Diagnosis and Correction
- Tire and Wheel Assembly Isolation Test
- Tire and Wheel Assembly Runout Measurement - Off-Vehicle
- Tire and Wheel Assembly Runout Measurement - On-Vehicle
- Tire and Wheel Inspection
- Vehicle-to-Vehicle Diagnostic Comparison
- Vibration Analysis - Driveline
- Vibration Analysis - Engine/Accessory Isolation
- Vibration Analysis - Engine Balance
- Vibration Analysis - Engine
- Vibration Analysis - Hub and/or Axle Input
- Vibration Analysis - Road Testing
- Vibration Analysis - Tire and Wheel
- Vibration Diagnostic Aids - Vibration Duplicated, Appears to Be Potential Operating Characteristic
- Vibration Diagnostic Aids - Vibration Duplicated, Component Not Identified
- Vibration Diagnostic Aids - Vibration Duplicated, Difficult to Isolate/Balance Component
- Vibration Diagnostic Aids - Vibration Intermittent or Not Duplicated
- Vibration Diagnostic Aids
- Vibration in Service-Stall Test (Non-Torque Sensitive)
- Vibration in Service-Stall Test (Torque Sensitive)
- Repair Instructions
- Driveline System Balance Adjustment (Using EVA)
- Driveline System Balance Adjustment (Without EVA)
- Driveline Working Angles Adjustment
- Propeller Shaft Phasing Correction
- Tire and Wheel Assembly Balancing - Off-Vehicle
- Tire and Wheel Assembly Balancing - On-Vehicle
- Tire and Wheel Assembly-to-Hub/Axle Flange Match-Mounting
- Tire-to-Wheel Match-Mounting (Vectoring)
- Description and Operation
- Special Tools and Equipment
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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.