My rear diff lock actuator was having extensive damage. It was full of rust inside, all gear, shafts everything heavily rusted and completely seized, the motor rotor was falling into pieces, i live in Canada where road salt in winter affects everything. I called dealer and i did not want to spend the 1500$ he wants for it so i designed a air actuated diff lock actuator. I did it two years ago and it worked perfectly since then. It cost me about 25$ to do it. I purchased a air cylinder and a solenoid valve on Ebay I have attached pictures of the dissambled and reassembled actuator. I installed a Oring in the groove on the cylinder head. The actuator rod is made with a 14 mm bolt. I drilled one hole at the end to attach it to the cylinder with a threaded rod and one hole on the side for the fork inside the differential. I also attached a autocad drawing of the mounting plate. If you access to a milling and a lathe with minimal knowledge than you save 1500$ in about 4 hours. I already had an air compressor in the truck for the air lift suspension. . It is working like the OEM one, with the switch on the left side of the steering column (i bypassed on wire at the diff lock controller behind the passenger side kick panel). I hooked the cylinder up to the 12 volts 4-way 5 ports solenoid valve at 30 psi. The only diffence between this and the OEM is that I can turn the diff lock on even if the center diff lock is not on.