* A 4WD 4L60E Transmission: This is the most obvious requirement. You can't simply adapt the 2WD case; you need a transmission case specifically designed for 4WD operation. This includes the correct planetary gearset, output shaft, and case itself.
* Transfer Case: You'll need a transfer case appropriate for your vehicle's year, make, and model. This will handle the power distribution to the front and rear axles. This isn't just a bolt-on; it will likely require adapter plates or modifications depending on your vehicle.
* Driveshafts: You'll need a front driveshaft to transfer power to the front axle. The length and configuration will be specific to your vehicle and the transfer case used. The rear driveshaft might also need modifications or replacement depending on the transfer case's output.
* Front Axle Components (If not already present): If your vehicle wasn't originally equipped with 4WD, you'll need a complete front axle assembly, including differential, axles, hubs, and suspension components. This is a major undertaking involving significant modifications to your vehicle's frame and suspension.
* Wiring Harness Modifications (Likely): The 4WD system will require additional wiring for the transfer case and possibly other 4WD-related components. This might involve splicing into the existing harness or installing a new one.
* Computer Programming (Possibly): The vehicle's computer needs to be programmed to recognize the 4WD system. This often requires a professional scan tool.
* Control Module/Transfer Case Actuator: A 4WD setup needs a control module to manage the engagement and disengagement of the front differential. Some transfer cases use an actuator controlled by this module.
In summary: This isn't a simple bolt-on swap. It's a major mechanical and possibly electrical overhaul that's far beyond the scope of a typical transmission swap. The cost, complexity, and required expertise make this a project best suited for experienced mechanics with access to specialized tools and equipment. It's often more cost-effective and practical to purchase a vehicle already equipped with 4WD.
