Component Replacement - Heavy Duty Conversion from First Design to Second Design
WARNING: This page is about a different car, the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, and 2018 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.
It is possible to repair a first-design HD assembly using second-design HD components. Refer to the parts catalog and the Parts Identification Tables above for component part number clarification.
When servicing a first-design HD assembly with HD second-design components, the following components MUST be replaced as a group:
- Front Case Half Assembly - with internal gear and retaining ring
- Locking Plate
- Thrust Washer (front)
- Input Shaft
- Pilot Bearing
- Thrust Washer (rear)
- Planetary Carrier Assembly
- High/Low Clutch
- Thrust Washer
- High/Low Planetary Carrier Assembly
- High/Low Clutch