You need to craw under the front of your GMC and on the passenger side on the front axle towards the middle you will see the actuator. You just simply unhook the wires to the actuator and the get a big wrench and loosen up the actuator up just like a bolt. It has a lot of threads on it so it might take a little bit. To install the new one just simply reverse the method. I hope this helps you out.
Located under right kick panel
On a 95 ranger, the 4wd actuator needed replacing. on a 95 ranger, the 4wd actuator needed replacing. However, you can put it in 4wd and tap the from housing and it will sometime go into gear. The lack of use causes the actuator to freeze-up.
On the side of the transfer case.
look under the battery tray
The 4WD actuator on a 1999 Ford Explorer is typically located on the transfer case, which is situated underneath the vehicle, near the rear of the engine. The actuator is mounted to the transfer case and is responsible for engaging and disengaging the 4WD system. To access it, you may need to raise the vehicle and remove any protective covers or components obstructing your view. Always refer to a repair manual for specific details and diagrams.
faulty actuator switch. GM had some problems with these.
We call it a horse dong, but to a partsman it would be a 4wd actuator and it is located in the front pumkin. There is a upgrade kit that can be purchased that will make it a manual engage and is generally cheaper than buying the actuator.
under the battery, remove the battery and battery tray
It is located on the transfer case. It controls the vaccum to the actuator.
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Several reasons may prevent the switch from changing from 2WD to 4WD, including a faulty switch, a problem with the transfer case, an issue with the actuator or vacuum lines, or a problem with the differential. It is advisable to have a mechanic diagnose the issue to determine the exact cause.
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