Help your four-wheel-drive system keep track of its shift motor's position with the Dorman - OE Solutions Transfer Case Encoder Ring, part number 600-120. This 4WD transfer case motor encoder ring replaces a failed original. It fits many vehicles, among them the 2003-2006 Chevrolet Silverado 1500, 2003-2006 GMC Sierra 1500 and 2003-2004 Chevrolet Silverado 2500. See the "Vehicles it fits" section for the full list and engine details.
The encoder ring works with the transfer case shift motor. It provides position feedback so the 4WD system can tell which drive mode the motor has selected. If a contaminated or damaged ring is the cause of your 4WD engagement trouble, this part replaces it.
- Direct replacement: Engineered to match the original ring's fit and function on the listed applications.
- Replaces a failed ring: Intended to take the place of a ring damaged by contamination or a collision.
- Durable construction: Made from quality materials and engineered for reliable performance and durability.
- Trusted support: Backed by a U.S.-based team of product experts and more than a century of automotive experience.
Signs this part may need replacing include a 4WD system that won't shift or engage, a service 4WD warning light, or flashing mode indicators. Diagnose the cause first, because the shift motor, wiring or control module can produce similar symptoms.
Interchange: 88962315 · TCA99
This part cross-references / interchanges with the following part numbers:
8.90E+07, 88962315, TCA99
Frequently Asked Questions
What does a transfer case encoder ring do?
It works with the transfer case shift motor. It provides position feedback so the 4WD system can tell which drive mode the motor has selected.
Which trucks does Dorman 600-120 fit?
It fits many vehicles, including the 2003-2006 Chevrolet Silverado 1500, 2003-2006 GMC Sierra 1500 and 2003-2004 Chevrolet Silverado 2500. Check the "Vehicles it fits" section for your exact vehicle.
What are signs the encoder ring may need replacing?
A 4WD system that won't shift or engage, a service 4WD light, or flashing mode indicators can be signs of a failed ring. Other parts cause similar symptoms, so diagnose the cause first.
What part numbers does Dorman 600-120 replace?
It cross-references to 88962315 and TCA99.
Does it install like the original ring?
Dorman designed it to match the original ring's fit and function on the listed applications. Follow the vehicle service information for the installation procedure.
