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Your cart is empty.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. This part is compatible with the following vehicles. Before purchasing, enter your vehicle trim in the garage tool to confirm fitment. [Chevrolet Blazer: 1992, 1993, 1994] - [Chevrolet K1500 Suburban: 1992, 1993, 1994, 1995, 1996] - [Chevrolet K1500: 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996] - [Chevrolet K2500 Suburban: 1992, 1993, 1994, 1995, 1996] - [Chevrolet K2500: 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996] - [Chevrolet K3500: 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996] - [Chevrolet Tahoe: 1995, 1996] - [GMC K1500 Suburban: 1992, 1993, 1994, 1995, 1996] - [GMC K1500: 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996] - [GMC K2500 Suburban: 1992, 1993, 1994, 1995, 1996] - [GMC K2500: 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996] - [GMC K3500: 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996] - [GMC Yukon: 1992, 1993, 1994, 1995, 1996]
Rob G.
Reviewed in the United States on January 7, 2025
Very well written instructions that include wiring diagrams to show exactly where the one wire needs to be spliced. Very easy to follow the instructions and install the kit. Worked exactly as expected and fixed my 4WD issue.
Dominic B.
Reviewed in the United States on January 14, 2025
Worked like it should 1995 suburban k1500
Ladydoitall
Reviewed in the United States on August 28, 2024
Works well once installed. Fit my '92 k1500 short box. Have to hardwire to the power from the transfer case. If I could do it, you can do it!
KCisco
Reviewed in Canada on June 26, 2024
Bought this Electronic version to replace the failed 4WD actuator in my 1996 Chev Silverado. The original has some sort of "heated wax" internals that is prone to failure, and very slow to actuate. This replacement is fully electronic and responds immediately when the 4WD button is pressed. It comes with the actuator, a small spacer, and the replacement wiring. The body of this actuator is slightly shorter than the original so a spacer (included) is needed inside the axle mounting tube to make up the difference. The dimension of this spacer is shown in my photos. The wiring comes with a detailed diagram and description of connections required. One end of the included wire loom plugs into the new actuator, the other end plugs into the 2 connector end from the original actuator on the truck, and then there's a third wire that must be connected to an ignition-on power wire somewhere in the truck. The required wire is a brown wire which is powered only when ignition is on. The suggested connection is to the brown wire going to the transfer case, but I found another brown wire next to my under-hood fuse box that was easier to access and worked just as well. Once installed, I discovered my 4WD switch was also problematic and needed to be removed and the connections cleaned. Once this was done the 4WD is engaging and disengaging reliably again and much faster than with the old "wax" actuator. My 4WD indicator lights are also now lighting up reliably again after not having worked for many years. Very happy with this replacement/ upgrade kit from Dorman. Hope this electronic version lasts longer than the old version.
Scott Broeker
Reviewed in the United States on May 20, 2024
The only way to go unless you like changing out thermal actuators works way faster and is easy to install just need to run one of the extra wires to a keyed ignition source. Tested it out before I even installed it to make sure it worked and it only takes about 3 seconds for it to engage and disengage
RDW
Reviewed in the United States on December 22, 2024
HAD PRODUCT IN TIMELY MANNER!
Jose
Reviewed in the United States on November 25, 2024
May have just gotten unlucky, requested for a replacement, we'll see how it goes. Wiring does work and it was pretty straight forward.
Customer
Reviewed in the United States on October 30, 2024
Fits and works great in my 1989 k1500. 20 minute install been working great for months now. Thanks, Dorman for putting this kit together and helping us keep these trucks going.
Alexandra Hesse-Alghamdi
Reviewed in the United States on April 11, 2024
Receiving connector on truck side to the old thermal actuator is different and won’t work with this harness in the kit. I had to take the old one out and connect it to the new wiring harness. I wish kit came with teflon tape and three zip ties. Besides that Great product. Fast engagement of 4x4 when done and done. Took some wiring work since I had to reuse old connector and I don’t know what is blue wire and black one. On Old thermal both are the same color. Truck side I had to figure out which to blue and which to black since I had to reuse old connector.
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