How to Replace Four Wheel Drive Actuator 01-14 GMC Sierra 2500
Difficulty: Intermediate · About 60 min · Gmc Sierra
Replace the four-wheel-drive actuator on a 2001–2014 GMC Sierra 2500 by removing the skid plate, aligning the new actuator with the transfer-case shaft, and checking engagement after reassembly.
Tools you will need
- 15mm Wrench
- Flat Blade Screwdriver
- 15mm Socket
- Slip-Joint Pliers
Parts and supplies
- Four-wheel-drive actuator
- Specified thread lubricant
Steps
- Remove the skid plate
Support the plate while removing its four mounting bolts. Lower it carefully and set it aside so it does not fall or damage nearby components.
- Disconnect the actuator wiring
Release the connector's safety tab with a flat screwdriver and unplug the harness. Inspect the connector for corrosion or bent terminals before installing another actuator.
- Remove the old actuator
Use suitable pliers on the actuator body or designated flats to turn it counterclockwise and remove it. Avoid crushing the housing or damaging the transfer-case threads.
- Install the replacement actuator
Apply lubricant only if specified by the replacement part instructions. Align the actuator with the shaft and thread it in by hand to avoid cross-threading, then tighten it only to the manufacturer's specification and reconnect the harness.
- Reinstall the skid plate and test four-wheel drive
Raise the skid plate into position and install its four bolts, tightening them to specification. Test the four-wheel-drive modes on an appropriate surface and confirm the indicator and actuator respond correctly.
Check your vehicle’s repair manual for exact specifications and fit.