Can You Put A 5.7 Hemi In A 4.7 Truck? Answered

The question Can You Put A 5.7 Hemi In A 4.7 Truck? captures the imagination of many truck enthusiasts and mechanics. This query isn’t just about the physical fitment; it delves into a broader spectrum of considerations, including mechanical compatibility, performance benefits, and legal aspects. The intrigue surrounding this modification stems from the 5.7 Hemi engine’s reputation for robust performance and reliability.

Contents show

Key Takeaways

Feasibility: Understanding the technical challenges and solutions.
Performance Gains: What improvements to expect with the 5.7 Hemi.
Cost Considerations: Analyzing the financial aspect of the swap.
Legal and Safety Implications: Ensuring compliance with laws and safety standards.

Can You Put A 5.7 Hemi In A 4.7 Truck?

Yes, it is possible to install a 5.7 Hemi engine into a truck originally equipped with a 4.7 engine. However, this engine swap is complex and involves numerous considerations, including the compatibility of components, the need for custom fabrication, and potential modifications to the truck’s chassis and drivetrain.

Technical Challenges and Solutions

Engine Mounts and Space: Custom mounts are often required. Space constraints may necessitate modifications to the engine bay.
Transmission Compatibility: The 5.7 Hemi may not mate with the existing transmission, calling for an upgrade or adaptation.
Electrical and Electronics: Integrating the new engine with the truck’s existing electrical system can be challenging. Custom wiring harnesses and ECU programming may be needed.

Performance Benefits

Increased Horsepower and Torque: Expect significant gains in power and acceleration.
Improved Towing Capacity: The enhanced power can lead to better towing performance.
Refined Driving Experience: A smoother and more responsive driving feel is often reported.

Cost Considerations

Undertaking a 5.7 Hemi swap into a 4.7 truck is a significant financial investment. The costs can vary widely based on the specifics of the project.

Parts and Labor Costs

Engine Purchase: The cost of a 5.7 Hemi engine itself can be substantial.
Additional Components: Factor in the cost of a compatible transmission, custom parts, and any required upgrades.
Labor: Professional installation can be costly due to the complexity of the job.

Long-Term Financial Impact

Increased Value: A successful swap can enhance the truck’s value.
Maintenance and Repairs: Be prepared for potentially higher costs associated with maintaining a more complex engine.

Legal and Safety Implications

It’s crucial to consider the legal and safety aspects of an engine swap. Compliance with emission standards and vehicle safety regulations is a must.

Emission Compliance

State and Federal Laws: Ensure the modified vehicle meets all relevant emission regulations.
Inspection and Certification: The truck may need to pass specific inspections to be road-legal.

Safety Standards

Structural Integrity: Ensure that the modifications do not compromise the vehicle’s safety.
Professional Installation: A professional installation can help ensure that safety standards are maintained.

Compatibility and Integration

Integrating a 5.7 Hemi into a 4.7 truck is more than just a mechanical fit. It involves ensuring compatibility across various systems.

Mechanical Compatibility

Cooling System: Upgrading the cooling system to handle the increased heat output.
Exhaust System: Custom exhaust solutions may be required to fit the new engine.

Electronic Integration

Sensor and Gauge Compatibility: Ensuring all sensors and gauges function correctly with the new engine.
Engine Control Unit (ECU): The ECU may need reprogramming to manage the 5.7 Hemi effectively.

Driving Experience and Performance

Swapping to a 5.7 Hemi transforms the driving experience of a 4.7 truck. The change is not just in power but also in how the vehicle handles and responds.

On-Road Performance

Acceleration and Power Delivery: Enjoy a noticeable improvement in acceleration and power.
Handling and Dynamics: Be aware of changes in the truck’s handling characteristics.

Off-Road and Towing Capabilities

Enhanced Off-Road Ability: The extra power can be beneficial in off-road scenarios.
Towing and Hauling: Increased torque aids in towing and hauling tasks.

Can You Put A 5.7 Hemi In A 4.7 Jeep Grand Cherokee?

Installing a 5.7 Hemi engine in a 4.7 Jeep Grand Cherokee is technically feasible, but it requires significant modifications. The 5.7 Hemi, known for its power and efficiency, offers a substantial upgrade over the 4.7 V8 engine.

This swap involves not just replacing the engine but also ensuring compatibility with the Jeep’s transmission, drivetrain, and electronic systems. Modifications might include custom engine mounts, transmission adaptation, and upgrades to the cooling and exhaust systems.

Professional installation is highly recommended due to the complexity of the project. This kind of modification is usually undertaken by enthusiasts looking for increased performance and is not standard practice for average users. The cost and effort involved can be considerable.

Is The 4.7 V8 A Hemi?

No, the 4.7 V8 engine used in vehicles like the Jeep Grand Cherokee is not a Hemi engine. The term “Hemi” refers to a type of engine with hemispherical combustion chambers, which is a design characteristic of certain Chrysler engines, notably the 5.7 Hemi.

The 4.7 V8, instead, has a different combustion chamber design and operates with a different performance profile compared to Hemi engines.

The 4.7 V8 is known for its balance of power and efficiency but doesn’t offer the same level of performance as the 5.7 Hemi. The differences in engine design also mean that swapping a 4.7 V8 for a 5.7 Hemi involves considerable mechanical changes.

Does The 4.7 And 5.9 Have The Same Transmission?

The 4.7 and 5.9 engines in Jeep vehicles do not necessarily use the same transmission. While there might be some overlap in the types of transmissions used in vehicles equipped with these engines, it’s not guaranteed that they are interchangeable.

The 5.9 engine, being older and typically found in earlier models, often uses different transmission systems compared to the newer 4.7 engine.

Transmissions are designed to handle specific torque and power outputs, and the differences between the 4.7 and 5.9 engines mean their transmissions might not be compatible without significant modifications.

When considering an engine swap or transmission replacement, it’s crucial to consult specific vehicle and engine documentation to determine compatibility.

Conclusion

Putting a 5.7 Hemi in a 4.7 truck is a complex but rewarding endeavor. It brings a significant performance boost and can transform the truck into a much more capable machine.

However, it’s essential to consider the technical, financial, legal, and safety aspects of such a swap. With careful planning and professional execution, this modification can lead to a truly enhanced driving experience.