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 MANUALSGMC2020SIERRA 2500 HD AT4, 6.6L ENG VIN YREPAIR AND DIAGNOSISDRIVELINES & AXLESDIFFERENTIALS & DRIVE AXLESREAR DRIVE AXLE
2020 GMC Sierra 2500 HD AT4, 6.6L Eng VIN Y
Rear Drive Axle
2020 GMC Sierra 2500 HD AT4, 6.6L Eng VIN YSECTION Rear Drive Axle
- Specifications
- Diagnostic Information and Procedures
- Symptoms - Locking/Limited Slip Rear Axle
- Symptoms - Rear Drive Axle
- Rear Drive Axle Noises
- Noisy in Drive
- Noisy When Coasting
- Intermittent Noise
- Constant Noise
- Noisy on Turns
- Wheel Bearing Wear - Rear Drive Axle (Straight)
- Wheel Bearing Wear - Rear Drive Axle (Tapered)
- Rear Axle Lubricant Leak Diagnosis
- Limited Slip Differential Diagnosis
- Locking Differential Diagnosis
- Locking Rear Axle Does Not Lock
- Locking Rear Axle Locks in Turns
- Locking Rear Drive Axle Chatters in Turns
- Noise in Addition to Normal Clutch Engagement
- Repair Instructions
- Rear Axle Lubricant Level Inspection
- Differential Oil Replacement
- Vent Hose Replacement
- Rear Axle Vent Hose Connector Replacement
- Rear Axle Housing Cover Replacement
- Rear Axle Housing Cover Gasket Replacement
- Rear Axle Shaft and Gasket Replacement
- Rear Wheel Hub Replacement (without DZW)
- Rear Wheel Hub Replacement (with DZW)
- Rear Wheel Inner and Outer Bearing and Rear Axle Shaft Seal Replacement (without DZW)
- Rear Wheel Inner and Outer Bearing and Rear Axle Shaft Seal Replacement (with DZW)
- Drive Pinion and Ring Gear Replacement
- Differential Drive Pinion Gear Bearing Replacement
- Differential Replacement
- Differential Bearing Replacement
- Wheel Speed Sensor Reluctor Ring Replacement (with DZW)
- Rear Axle Replacement
- Rear Axle Housing Replacement
- Differential Drive Pinion Gear Seal Replacement
- Differential Drive Pinion Gear Yoke Replacement
- Differential Overhaul
- Bearings Inspection
- Differential Inspection
- Pinion and Ring Gear Inspection
- Rear Axle Housing Inspection
- Shims Inspection
- Rear Axle End Play Adjustment
- Pinion Depth Adjustment
- Differential Carrier Bearing Preload Adjustment
- Wheel Bearing Adjustment (First Design SRW)
- Wheel Bearing Adjustment (DZW)
- Wheel Bearing Adjustment (Second Design SRW)
- Backlash Adjustment
- Gear Tooth Contact Pattern Inspection
- Locking Differential Disassemble
- Locking Differential Clutch Disc Assembly Disassemble
- Locking Differential Cam Unit Disassemble
- Locking Differential Cleaning and Inspection
- Locking Differential Cam Unit Assemble
- Locking Differential Clutch Disc Assembly Assemble
- Locking Differential Adjustment
- Locking Differential Assemble
- 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.