The 4WD systems on many older Chevrolet and GMC trucks utilize a thermal differential actuator which is prone to sluggishness and failure when the wax that drives the actuator piston ages and deteriorates, ultimately disabling the 4WD system. This convenient 4WD differential actuator upgrade kit contains the key components required to easily replace the original equipment thermal actuator with a faster-acting electric actuator designed to provide longer, more reliable service. The kit contains our part number 600-101 4WD electric actuator and our part number 600-600 4WD actuator harness, both of which are carefully engineered to precise specifications to update an old technology thermally-activated differential to a more efficient electric differential on specified GM vehicle makes, models and years.

4WD Actuator and Wiring Harness Upgrade Kit 600-490 Features:

• Fits 1988-1996 Chevrolet; 1988-1996 GMC
• Upgraded repair — this 4WD differential actuator upgrade kit is designed to update a thermally activated differential to a more efficient electric differential on specified Chevrolet and GMC trucks
• Complete solution — this kit includes a 4WD electric actuator and 4WD actuator harness, the key components required to update a 4WD differential
• Updated technology — effective replacement for an old technology original equipment thermal differential actuator that is sluggish or has failed, disabling the 4WD system
• Trustworthy quality — backed by a team of product experts in the United States and more than a century of automotive experience