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.
2021 GMC Yukon AT4FACTORY OEM SERVICE PROCEDURE
Removal & Installation
WARNING: This page is about the Yukon Denali, 3.0L Eng VIN T, 4WD, which is a different variant/trim than selected.
| Applies To | Note | Standard Hours | Warranty Hours | Skill Level |
|---|---|---|---|---|
| 3.0L Eng,4WD, w/Air Suspension | Includes: R&I Fender Liner. Includes: R&I Catalytic Converter. Includes: R&I Starter Assembly. Includes: R&I Propeller Shaft. Includes: R&I Transmission Support. Includes: R&I Transfer Case Assembly. Includes: Drain and Refill Air Suspension System. Includes: Additional time for use of scan tool to perform this procedure. Includes: Check and adjust Transmission Fluid level with fluid temperature within parameters. | 12.1 | C | |
| 3.0L Eng,4WD, w/o Air Suspension | Includes: R&I Fender Liner. Includes: R&I Catalytic Converter. Includes: R&I Starter Assembly. Includes: R&I Propeller Shaft. Includes: R&I Transmission Support. Includes: R&I Transfer Case Assembly. Includes: Check and adjust Transmission Fluid level with fluid temperature within parameters. | 11.7 | C | |
| Additional Procedure: TRANSMISSION ASSEMBLY: Removal & Installation: | ||||
| Where Skid Plate interferes add | 0.2 | C | ||
| Combination Procedure: CONVERTER: Drain & Test: | ||||
| 0.2 | C | |||
| Combination Procedure: CRANKSHAFT MAIN OIL SEAL: Remove & Replace: | ||||
| 3.0L Eng, Rear,Timing Chain Lower Cover | Includes: Reset Oil Life Monitor. | 1.2 | B | |
| Combination Procedure: FLYWHEEL: Remove & Replace: | ||||
| 0.3 | C | |||
| Combination Procedure: TORQUE CONVERTER: Remove & Replace: | ||||
| 0.1 | C | |||
| Combination Procedure: TRANSFER CASE ASSEMBLY: Overhaul: | ||||
| 4WD | 4.3 | A | ||
| Combination Procedure: TRANSFER CASE ASSEMBLY: Replace: | ||||
| 4WD | Includes: Perform Relearn procedure. | 0.5 | C | |
| Combination Procedure: TRANSMISSION ASSEMBLY: Replace: | ||||
| Includes: Transmission Programming and Calibration of Learned Parameters. | 0.8 | C | ||
Factory Service Tools
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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.
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