Here's what you need to consider:
* Engine Choice: Many diesel options exist, from older, readily available automotive diesels (like some Mercedes-Benz or Cummins engines) to newer, more efficient (but more expensive) options. The engine's size and weight will heavily influence the difficulty of the swap and necessary modifications.
* Transmission: You'll likely need a transmission compatible with the chosen diesel engine. The stock transmission might not be suitable, requiring a replacement and potentially custom mounts.
* Engine Mounts: New engine mounts will be required, likely custom-fabricated to fit the diesel engine into the Grand Wagoneer's engine bay.
* Driveshaft: The driveshaft length might need adjustment to accommodate the different engine and transmission.
* Fuel System: A diesel fuel tank, fuel lines, and potentially a lift pump will be needed.
* Wiring Harness: The vehicle's electrical system will need modification to accommodate the diesel engine's sensors and controls. This often involves significant rewiring.
* Exhaust System: A new exhaust system will be required, likely custom-fabricated.
* Cooling System: The diesel engine's cooling requirements might differ from the original gasoline engine, necessitating modifications to the radiator and cooling system.
* Emissions: Depending on your location, meeting emission standards after the swap might be challenging and require additional components or modifications.
* Cost: This project is expensive. The cost of the engine, transmission, fabrication, parts, and professional labor (if you don't do all the work yourself) can easily reach tens of thousands of dollars.
In short, while technically feasible, swapping a diesel into an '86 Grand Wagoneer is a complex and labor-intensive project best undertaken by experienced mechanics with fabrication skills. Thorough planning and research are essential for success.
