This guide provides a comprehensive Ram 1500 engine swap compatibility chart, covering V6, V8 Magnum, HEMI, diesel, and high-performance engines. It also explains what makes an engine swap easy, moderate, or advanced, so you can plan your project realistically.
Ram 1500 Dodge Engine Swap Compatibility Chart
| Engine | Engine Family | Factory Engine Years | Compatible Ram 1500 Years | Transmission Compatibility | Swap Difficulty | Notes |
|---|---|---|---|---|---|---|
| 3.6L V6 | Pentastar | 2011–Present | 2011–Present | 65RFE, 8HP70 | Easy | Direct replacement in same-generation trucks |
| 3.7L V6 | PowerTech | 2002–2012 | 2002–2012 | 42RLE, 545RFE | Easy | Requires matching PCM and wiring |
| 3.9L V6 | Magnum | 1992–2003 | 1994–2003 | 42RE, 46RE | Moderate | Shares architecture with 5.2L Magnum |
| 4.0L V6 | SOHC | 2000–2004 | 1998–2004 | 45RFE | Moderate | Limited support; wiring modifications required |
| 4.7L V8 | PowerTech | 1999–2009 | 1999–2009 | 45RFE, 545RFE | Easy | Common factory replacement engine |
| 5.2L V8 | Magnum / LA 318 | 1992–2002 | 1994–2003 | 46RE, 47RE | Moderate | ECU and sensor compatibility critical |
| 5.9L V8 | Magnum / LA 360 | 1992–2003 | 1994–2003 | 46RE, 47RE | Moderate | Direct physical fit; electronics vary by year |
| 5.7L V8 | HEMI | 2003–Present | 2003–Present | 545RFE, 65RFE, 8HP70 | Easy–Moderate | Most popular Ram 1500 upgrade |
| 6.1L V8 | HEMI SRT | 2005–2010 | 2003–2010 | NAG1, 545RFE | Advanced | Requires drivetrain and suspension upgrades |
| 6.4L V8 | HEMI 392 | 2011–Present | 2011–Present | 8HP70, 8HP75 | Advanced | Custom mounts, PCM, and fuel system needed |
| 6.2L V8 | Supercharged HEMI | 2019–Present | 2019–Present | 8HP95 | Expert | Extensive cooling, fuel, and drivetrain upgrades |
| 8.0L V10 | Magnum | 1994–2002 | 1994–2002 | 47RE, NV4500 | Expert | Heavy modifications; front suspension upgrades required |
| 3.0L V6 | EcoDiesel | 2014–Present | 2014–Present | 8HP70, 8HP75 | Advanced | Diesel wiring, emissions, and fuel system complexity |
| 5.9L I6 | Cummins Diesel | 1989–2007 | 1994–2008 | NV4500, 47RE, 48RE | Expert | Frame, suspension, and axle upgrades required |
| 6.7L I6 | Cummins Diesel | 2007–Present | 2009–Present | 68RFE, Aisin | Expert | Major structural and electronic modifications |
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Understanding Ram 1500 Engine Swap Compatibility
Not all engine swaps are equal. Ram 1500 engine swaps typically fall into three categories based on complexity.
Direct or Easy Engine Swaps
These swaps involve engines that were factory-installed in the Ram 1500 during the same generation.
Common examples:
- 3.7L V6 replacing another 3.7L V6
- 4.7L V8 swapping within 1999–2009 trucks
- 5.7L HEMI replacing an existing HEMI
Why are they easier?
- Engine mounts line up
- Transmission bolts directly
- Factory wiring and sensors are compatible
These swaps are ideal for replacing a worn engine or restoring factory performance.
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Moderate Difficulty Engine Swaps
Moderate swaps typically involve engines from the same era but with different trims or displacements.
Examples:
- 5.2L Magnum to 5.9L Magnum
- 4.7L V8 to early 5.7L HEMI
Challenges include:
- PCM and wiring harness changes
- Sensor compatibility issues
- Exhaust and cooling adjustments
These swaps are common among enthusiasts but require more planning and technical knowledge.
Advanced and Performance Engine Swaps
Advanced swaps involve engines that were never factory-installed in standard Ram 1500 trims.
Examples:
- 6.1L HEMI SRT
- 6.4L HEMI 392
- 6.2L Supercharged HEMI
- 3.0L EcoDiesel conversions
Challenges include:
- Custom engine mounts
- Transmission upgrades
- Standalone or reprogrammed engine control modules
- Emissions system integration
- Upgraded fuel and cooling systems
These swaps are best suited for experienced builders or performance shops.
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Key Factors That Affect Ram 1500 Engine Swaps
Engine Mounts and Fitment
While many Dodge engines share similar block designs, mount locations can differ. HEMI swaps often require different mounts compared to Magnum or PowerTech engines.
Transmission Compatibility
Matching the engine to the correct transmission is critical. Many newer engines require modern transmissions such as the 8HP70 or 8HP75, while older trucks use 46RE or 545RFE units.
Electronics and PCM
Modern Ram trucks rely heavily on electronics. A mismatched PCM or wiring harness can prevent the engine from starting or cause drivability issues.
Emissions and Legal Compliance
In many regions, the replacement engine must meet or exceed the original emissions standards of the truck. Swapping newer engines into older trucks is usually easier to certify than the reverse.
Why Ram 1500 Owners Perform Engine Swaps
Engine swaps are popular for several reasons:
- Increased horsepower and torque for towing or performance
- Improved reliability compared to aging engines
- Better fuel efficiency with modern engines
- Customization for off-road, work, or street performance builds
The 5.7L HEMI remains the most popular upgrade due to its balance of power, availability, and compatibility.
Final Thoughts
A Ram 1500 engine swap can dramatically change how your truck performs, but success depends on choosing the right engine for your truck’s generation. Using a compatibility chart helps avoid costly mistakes related to wiring, transmission mismatch, and fitment issues.
Before starting any swap, verify your truck’s year, drivetrain configuration, and emissions requirements. Proper planning ensures a smoother installation and long-term reliability.
