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.
2020 Buick Envision BaseFACTORY OEM SERVICE PROCEDURE
Power Transfer Unit/Transfer Case - AAM
- Specifications
- Visual Identification
- Diagnostic Information and Procedures
- Repair Instructions - On Vehicle
- Drain Plug Replacement
- Fill Plug Replacement
- Intermediate Drive Shaft Replacement
- Power Transfer Unit Cover to Intermediate Drive Shaft Seal Replacement
- Output Shaft Seal Replacement
- Intermediate Drive Shaft Bearing Replacement
- Power Transfer Unit Face Seal Replacement
- Transfer Case Bracket Replacement
- Transmission Brace Replacement
- Power Transfer Unit Case Replacement
- Repair Instructions - Off Vehicle
- Description and Operation
- Special Tools and Equipment
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.