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Can you put a Cummins 5.9 diesel engine in 1985 1 ton dodge pickup truck?

Yes, you *can* put a Cummins 5.9L diesel engine in a 1985 Dodge 1-ton pickup truck, but it's a significant undertaking, not a simple bolt-in swap. It requires substantial modifications and fabrication. Here's why:

* Mounting: The engine mounts won't line up. You'll need custom motor mounts.

* Transmission: The stock transmission likely won't be strong enough to handle the torque of the Cummins. You'll probably need a stronger transmission, potentially a manual transmission designed for heavier-duty applications. This might require adapting the transmission to the Cummins engine.

* Driveshaft: The driveshaft will need to be modified or replaced to accommodate the new engine and transmission.

* Wiring Harness: The electrical systems are completely different. You'll need a new wiring harness or extensive rewiring.

* Fuel System: The Cummins requires a different fuel system than the original gasoline or smaller diesel engine. This includes the fuel tank, lines, and possibly a lift pump.

* Exhaust System: A custom exhaust system will be required.

* Cooling System: The cooling system might need upgrades to handle the heat generated by the Cummins. A larger radiator and potentially different fan setup may be needed.

* Steering: The increased weight of the Cummins might require steering upgrades for better control.

* Brakes: The heavier engine may necessitate upgrading the braking system for better stopping power.

In short, while technically feasible, this swap is a major project requiring significant mechanical skills, welding, fabrication expertise, and access to specialized parts. It's not a weekend project. It's often considered a project best suited for experienced mechanics or engine swap specialists. You'll also need to consider legal and emissions compliance in your area.