Where is this 4x4 shift motor located at and how do you take it off on a 2002 Ford Explorer?

The 4x4 shift motor on a 2002 Ford Explorer (assuming you mean the motor for the electronic shift-on-the-fly system, not a manual transfer case shifter) is located on the top of the transfer case. It's a relatively small electric motor, often with a linkage connected to it. The exact location on the transfer case will vary slightly depending on the transfer case type (e.g., BorgWarner 4405, etc.), but it's always on top and usually towards the rear.

Removing it requires some mechanical aptitude and the right tools. This is not a beginner's job. Improper removal could damage the transfer case or the motor itself. Here's a general outline, but this is NOT a comprehensive guide and may not apply to every specific transfer case:

1. Disconnect the battery: This is crucial to prevent accidental shorts and damage to the electrical system.

2. Locate the shift motor: Get under the vehicle and identify the motor on top of the transfer case.

3. Disconnect the electrical connector: Carefully unplug the electrical connector from the motor. Take a picture beforehand to help with reassembly.

4. Disconnect the linkage: There's a linkage connecting the motor to the shift mechanism inside the transfer case. This usually involves removing a clip, bolt, or possibly a cotter pin. Again, take pictures before disconnecting.

5. Remove the shift motor mounting bolts: The motor is typically held in place by a few bolts. Carefully remove these bolts.

6. Remove the shift motor: Gently pull the motor away from the transfer case.

Important Considerations and Warnings:

* Consult a repair manual: A factory service manual specific to your 2002 Ford Explorer is absolutely essential. It will have detailed diagrams, torque specifications, and step-by-step instructions that are far more accurate and complete than this general overview.

* Tools: You'll need the right tools, including sockets, wrenches, possibly a ratchet, and maybe even a special tool for removing the linkage.

* Transfer Case Fluid: You might lose some transfer case fluid during this process. Have fresh fluid on hand and be prepared to check and/or refill it afterward.

* Safety: Work in a well-ventilated area and support the vehicle properly on jack stands. Never work under a vehicle supported only by a jack.

If you're not comfortable performing this repair yourself, take your vehicle to a qualified mechanic. Attempting this repair without the proper knowledge and tools could lead to more serious and expensive problems. The cost of a professional repair will likely be less than the cost of fixing a mistake made during a DIY attempt.