Dodge NV5600 Transmission

Dodge Ram Emblem

Convert your Dodge NV5600 to an Allison

Transform Your Drive: Making the Switch to an Allison 1000PK Transmission

Configure your truck

Upgrade your driving experience with a Dodge NV5600 to Allison 1000PK Transmission Conversion, the perfect solution for maximizing your vehicle’s performance, efficiency, and reliability. The Allison 1000PK, renowned for its seamless shifting, remarkable durability, and top-tier load-carrying capacity, stands as a gold standard in automatic transmissions. By converting from the Dodge NV5600, a manual six-speed, to the Allison 1000PK, you not only gain the ease and convenience of an automatic transmission but also benefit from enhanced fuel efficiency and towing capabilities that Allison is celebrated for. Whether you’re navigating rugged terrains, hauling heavy loads, or simply desiring a smoother ride, this conversion is your ticket to transforming your Dodge into a powerhouse of performance and reliability. Elevate your driving experience — make the switch to the Allison 1000PK today.

NV5600 Transmission: An Overview, Key Features, and Common Concerns

Overview of the NV5600 Transmission

The NV5600 is a six-speed manual transmission designed and manufactured by New Venture Gear (NVG), a former joint venture between Chrysler and General Motors. Introduced in the late 1990s, the NV5600 quickly gained widespread acclaim among heavy-duty truck enthusiasts for its robust construction and exceptional torque capacity. Engineered primarily for use in Dodge Ram 2500 and 3500 series trucks equipped with the renowned Cummins turbodiesel engine, this transmission has proven itself to be remarkably reliable and capable of handling rigorous applications, particularly in the context of heavy towing and hauling duties.

Its fully synchronized gears, including a dual-cone synchronizer on 2nd and 3rd gears, allow for smoother and more precise shifting, making it a popular choice for those who prefer the control that comes with a manual transmission. Constructed with a cast iron case and an aluminum shift cover, the NV5600 is built to endure — its design speaks to both durability and functionality. With a respectable gear ratio spread, it allows for comfortable and fuel-efficient highway cruising, while still offering enough low-end grunt for substantial towing and payload capacities.

However, as manual transmissions have become increasingly rare in modern trucks, the NV5600 represents a bygone era to some extent. It appeals to a specific kind of driver — one who values the tactile engagement and direct control that a manual transmission provides. For those who are willing to forego the convenience of an automatic for a more hands-on and connected driving experience, the NV5600 remains a cherished and sought-after option.

NV5600 Features

The NV5600 transmission is a powerhouse designed for heavy-duty trucks, most notably the Dodge Ram 2500 and 3500 series. It is celebrated for its durability and its ability to handle high torque applications, a primary reason why it was often paired with the Cummins turbodiesel engines in Dodge trucks. Here are some key features that make the NV5600 stand out:

  • High Torque Capacity: The NV5600 offers a six-speed manual shifting experience, allowing drivers to have precise control over their vehicle's performance and fuel economy.
  • High Torque Capacity: Engineered for heavy-duty applications, the NV5600 is designed to handle high levels of torque, making it ideal for towing and hauling heavy loads.
  • Fully Synchronized Gears: All gears, including reverse, are synchronized in the NV5600, which allows for smoother and quicker shifts. This transmission features a dual-cone synchronizer on 2nd and 3rd gears for enhanced shifting precision.
  • Durable Construction: The NV5600 is built to last, with a rugged cast iron case and an aluminum shift cover. Its construction is robust and designed to withstand the rigors of heavy-duty truck use.
  • Wide Gear Ratio Spread: The NV5600 has a broad range of gear ratios, from a deep 5.63:1 first gear for heavy hauling to a 0.73:1 overdrive sixth gear that allows for fuel-efficient highway cruising.
  • Integrated Oil Cooler Ports: To help maintain optimal operating temperatures and prolong the life of the transmission, the NV5600 features ports for an external oil cooler.
  • PTO (Power Take Off) Capability: The NV5600 was available with an option for PTO, which allows for the transmission to power auxiliary equipment—a crucial feature for many commercial applications.
  • Clutch Engagement: The NV5600 typically employs a 13-inch single-disc clutch, which provides strong and reliable engagement, essential for heavy-duty and high-torque applications.
  • Direct and Responsive Shifting: As a manual transmission, the NV5600 offers a level of driver engagement that can’t be matched by automatic counterparts. It provides a tactile and direct connection between the driver and the vehicle.
  • Aftermarket Support: Due to its popularity among enthusiasts and its longstanding presence in the market, there is robust aftermarket support for the NV5600. This includes a wide variety of parts and upgrade options that allow owners to customize and further improve their transmission’s performance.

In summary, the NV5600 is a robust, reliable, and versatile manual transmission designed to handle the rigorous demands of heavy-duty truck applications. Its features are tailored to offer drivers precise control, substantial towing capacity, and enduring performance under a variety of conditions.

NV5600 Common Issues and Signs of Failures

While the NV5600 transmission is revered for its durability and heavy-duty performance, like any mechanical component, it can have its share of issues. Here are some common problems associated with the NV5600 transmission, along with signs that it might be failing:

  • Synchro Wear: Over time, the synchronizers, which help the gears in the transmission mesh smoothly, can wear down. This can lead to hard shifting, grinding noises when changing gears, and potentially gears popping out of place.
  • Clutch Problems: Due to the high torque applications this transmission is often subjected to, the clutch can wear out or fail, resulting in difficulty shifting, complete loss of drive, or a soft or spongy clutch pedal.
  • Input Shaft Issues: Under heavy loads, the input shaft can suffer from extreme stress. Signs of a failing input shaft might include noisy operation in certain gears or complete loss of drive.
  • Bearing Failures: The NV5600's bearings, particularly the input and output shaft bearings, can wear out over time. This typically results in noisy operation, including whining or grinding sounds, especially when the clutch is engaged or disengaged.
  • Oil Contamination and Lubrication Issues: Proper lubrication is critical for the NV5600. If incorrect or contaminated fluid is used, it can lead to accelerated wear and potential failure. Signs of this might include noisy operation, hard shifting, and excessive heat.
  • Fifth Gear Nut Backing Off: A known issue with some NV5600 transmissions is the fifth gear nut loosening and backing off. This can lead to fifth gear becoming inoperative and may cause additional damage if not addressed promptly.
  • Shift Fork Wear: The shift forks, which are used to engage the various gears, can wear or break. This typically results in difficulty shifting into or staying in certain gears.
  • Case Flex and Cracking: Under extremely heavy loads, the case of the NV5600 can flex, which may lead to misalignment of internal components and potential cracking of the case itself. This is generally accompanied by leaking fluid and noisy operation.
  • Overheating : Heavy towing and hauling can lead to excessive heat, which is a common killer of transmissions. Overheating can lead to warped components, fluid breakdown, and eventual transmission failure.
  • Gears or Shaft Breakage: Under extreme stress, particularly in situations of shock loading (sudden application of high torque), the gears or shafts inside the NV5600 may break. This will result in a sudden loss of drive and likely loud noises from the transmission.

It is worth noting that regular maintenance, including proper lubrication with the correct transmission fluid and timely replacement of worn components, can significantly extend the life of an NV5600 transmission and prevent many of these issues.

When experiencing any of these symptoms, it is advisable to consult with a professional mechanic or transmission specialist to diagnose and address the problem before it leads to a complete transmission failure.

Your Guide to Rebuilding, Replacing, and Upgrading to an Allison Transmission

Rebuild, Replace, Converting to an Allison

Convert to Allison

Converting to an Allison 1000PK Transmission

Converting from the NV5600 to an Allison 1000PK transmission is a complex process, requiring careful planning, specialized tools, and expertise in transmission swaps. The conversion encompasses more than just the physical transmission, as you’re transitioning from a manual to an automatic system. Here's an outline of the steps involved:

  1. Research and Planning

    • Determine the compatibility of the Allison 1000PK with your vehicle's engine and drivetrain.
    • Ensure you have access to any necessary custom parts or kits designed for this conversion.
    • Compile a comprehensive list of parts and tools required for the job.
  2. Acquire Necessary Parts

    • Purchase the Allison 1000PK transmission.
    • Acquire a new or modified bell housing compatible with your engine.
    • Obtain a suitable transmission control module (TCM) for the Allison.
    • Get any required wiring harnesses, adapters, and connectors.
    • Source an upgraded or suitable transmission cooler.
  3. Removal of NV5600

    • Disconnect the battery.
    • Drain the transmission fluid.
    • Disconnect the transmission linkage, driveshaft, and any associated wiring or hydraulic connections.
    • Remove the NV5600 transmission from the vehicle.
  4. Preparation and Modification

    • Check the vehicle's transmission tunnel for adequate space. Modify or fabricate as necessary to accommodate the Allison 1000PK.
    • If the existing motor mounts, crossmembers, or transmission mounts are incompatible, install or fabricate new ones.
  5. Install the Allison 1000PK

    • Position the new transmission using a transmission jack and bolt it to the engine using the appropriate bell housing.
    • Ensure all connections are secure, including any mechanical linkage or hydraulic lines, if applicable.
  6. Electronics and Wiring

    • Install the TCM in an appropriate location, typically within the vehicle's cabin or engine bay.
    • Route and connect the wiring harness, ensuring all connections are secure.
    • Integrate the Allison's electronics with the vehicle's existing electrical system, making certain the TCM communicates correctly with the engine control unit (ECU).
  7. Cooling System Installation

    • Install the transmission cooler, ensuring it’s adequately positioned for airflow.
    • Connect the transmission cooling lines between the Allison 1000PK and the cooler.
  8. Drive Shaft and Final Connections

    • Depending on the length adjustment requirements, either modify the existing driveshaft or obtain a custom one.
    • Install the driveshaft, ensuring it's correctly aligned and securely connected at both ends.
  9. Fluids and Testing

    • Fill the Allison 1000PK with the recommended transmission fluid.
    • Reconnect the battery.
    • Start the vehicle and test all gear positions for correct operation.
    • Take the vehicle for a test drive, ensuring the transmission shifts smoothly and the TCM functions correctly.
  10. Final Adjustments

    • After the test drive, check for any leaks, noises, or irregularities.
    • Make any necessary adjustments to the linkage, wiring, or other components.

Documentation and Legal Considerations:

  • Ensure all changes to the vehicle are documented for future reference or resale.
  • Check with local regulations to ensure the conversion is compliant with emissions, safety, or other legal requirements.

Due to the complexity of this conversion, it's highly recommended to work with a mechanic or shop that has experience with transmission swaps, particularly from manual to automatic systems. Properly executed, this conversion can result in a vehicle that harnesses the reliability and performance of the Allison 1000PK.

NV5600 Rebuild

Rebuilding the Dodge NV5600 Transmission

Rebuilding an NV5600 transmission is a detailed and meticulous process that requires a good understanding of transmission components, as well as access to specialized tools. The goal of a rebuild is to restore the transmission to optimal working condition by replacing worn or damaged parts. Here's a step-by-step outline of the process:

  1. Preparation and Safety: Make sure the work area is clean and organized. Disconnect the battery of the vehicle, and ensure you have all necessary tools and parts before starting.
  2. Disassembly: Carefully disassemble the NV5600 transmission, organizing and inspecting all components as they are removed. Take note of any visibly worn or damaged parts.
  3. Cleaning: Clean all disassembled parts thoroughly with a parts cleaner solution or solvent. This is crucial for revealing any hidden wear or damage.
  4. Inspection and Assessment: Closely inspect all components, including gears, bearings, synchronizers, shafts, and seals for wear or damage. Use this inspection to compile a list of parts that need replacement.
  5. Acquire Replacement Parts: Based on the inspection, purchase the necessary replacement parts. This will likely include bearings, seals, gaskets, and potentially gears or synchronizers.
  6. Reassembly with New Parts: Carefully reassemble the NV5600 transmission, replacing the worn or damaged parts with the new components. Pay close attention to the reassembly order and torque specifications for all bolts and fasteners.
  7. Gear and Bearing Preload Setting: Set the preloads for bearings as per the manufacturer’s specifications. This is a critical step to ensure the transmission operates smoothly and without excessive wear.
  8. Sealing and Gasket Installation: Install new seals and gaskets during reassembly to prevent any fluid leaks. Make sure all surfaces are clean and flat before installing the gaskets.
  9. Final Assembly and Inspection: Once the NV5600 is reassembled, double-check all components, fasteners, and settings. Make sure everything is installed correctly and torqued to the proper specifications.
  10. Reinstallation of the Transmission: Once the NV5600 is reassembled, double-check all components, fasteners, and settings. Make sure everything is installed correctly and torqued to the proper specifications.
  11. Refill with Transmission Fluid: After the transmission is reinstalled, fill it with new, clean transmission fluid to the proper level as per the manufacturer’s specifications.
  12. Testing: Reconnect the battery and start the vehicle. Carefully test all gears under controlled conditions. Listen for unusual noises and feel for smooth shifting without grinding.
  13. Road Test: After the initial tests are successful, take the vehicle for a test drive under various conditions. Pay attention to the shifting behavior of the transmission and ensure that it operates smoothly and responsively.
  14. Final Adjustments and Checks: After the road test, recheck the fluid levels and look for any signs of leaks or unusual noises. Make any necessary adjustments based on the road test feedback.
  15. Documentation: Keep detailed records of the rebuild process, including parts replaced and any issues encountered. This documentation can be invaluable for future maintenance or repair.

Please note that rebuilding a transmission is a highly technical task that generally requires a skilled mechanic or experienced DIYer. Specialized tools and manuals specific to the NV5600 are often necessary. Always refer to a service manual for the most accurate and detailed information.

Replace NV5600

Replacing the Dodge NV5600 Transmission

Replacing an NV5600 transmission involves removing the old unit from the vehicle and installing a new or rebuilt one. This is a substantial project that requires a good understanding of automotive mechanics and access to the right tools. Here's a step-by-step guide to replacing an NV5600 transmission:

  1. Preparation

    • Prepare a clean, organized workspace.
    • Gather all necessary tools, including a transmission jack, wrench set, and other specialty tools.
    • Make sure you have the replacement NV5600 transmission ready.
  2. Acquire Necessary Parts

    • Purchase the Allison 1000PK transmission.
    • Acquire a new or modified bell housing compatible with your engine.
    • Obtain a suitable transmission control module (TCM) for the Allison.
    • Get any required wiring harnesses, adapters, and connectors.
    • Source an upgraded or suitable transmission cooler.
  3. Safety First

    • Disconnect the vehicle’s battery to ensure safety while working with electrical components.
    • Secure the vehicle with wheel chocks and jack stands to prevent any movement.
  4. Drain the Transmission Fluid

    • Place a drain pan under the transmission and remove the drain plug to allow the fluid to drain completely.
  5. Remove Driveshaft and Linkages

    • Disconnect the driveshaft from the transmission.
    • Remove shift linkages and any associated hardware.
  6. Disconnect Electrical and Hydraulic Connections

    • Unplug any electrical connections related to the transmission, such as sensors.
    • Disconnect the hydraulic clutch line, if applicable.
  7. Support and Remove the Transmission

    • Place a transmission jack under the NV5600 to support its weight.
    • Remove the bolts that secure the transmission to the engine and the transmission mount bolts.
    • Carefully lower and remove the transmission from the vehicle.
  8. Drive Shaft and Final Connections

    • Depending on the length adjustment requirements, either modify the existing driveshaft or obtain a custom one.
    • Install the driveshaft, ensuring it's correctly aligned and securely connected at both ends.
  9. Inspect and Prepare the Replacement Transmission

    • Inspect the replacement NV5600 transmission for any issues and ensure it is clean and ready for installation.
    • Install a new clutch assembly if necessary (pressure plate, disc, throw-out bearing, etc.).
  10. Install the Replacement Transmission

    • Using the transmission jack, carefully lift the replacement NV5600 into position.
    • Align it with the engine and secure it in place with the appropriate bolts. Torque the bolts to the manufacturer’s specifications.
  11. Reconnect Electrical and Hydraulic Connections

    • Plug in any electrical connections related to the transmission and reconnect the hydraulic clutch line, if applicable.
  12. Install Driveshaft and Linkages

    • Reinstall the driveshaft and reconnect it to the transmission.
    • Reattach shift linkages and any associated hardware.
  13. Refill the Transmission with Fluid

    • After the transmission is secured, fill it with the recommended transmission fluid to the proper level as per the manufacturer’s specifications.
  14. Reconnect the Battery and Test

    • Reconnect the vehicle’s battery.
    • Start the vehicle and carefully test all gears under controlled conditions. Listen for unusual noises and feel for smooth shifting without grinding.
  15. Road Test

    • After the initial tests are successful, take the vehicle for a test drive under various conditions. Pay close attention to the shifting behavior of the transmission and ensure that it operates smoothly and responsively.
  16. Check for Leaks and Final Inspection

    • After the road test, inspect the transmission and connections for any leaks or loose bolts and make any necessary adjustments based on the road test feedback.
  17. Document the Replacement

    • Keep detailed records of the transmission replacement, including the date, any parts replaced, and any issues encountered. This documentation can be invaluable for future maintenance or repairs.

Please note that replacing a transmission is a significant and complex task. It's typically best handled by a professional mechanic or someone with substantial automotive repair experience. Always consult a service manual for the most accurate and detailed information specific to the NV5600 transmission and your vehicle.

Benefits of converting to an Allison 1000PK Transmission

Converting from a Dodge NV5600 manual transmission to an Allison 1000PK automatic transmission can bring several benefits, depending on the specific needs and use of the vehicle. Here are some notable advantages of making such a conversion

Ease of Operation

The Allison 1000PK is an automatic transmission, which makes the vehicle easier to drive, especially in heavy traffic conditions where a manual transmission can be cumbersome.

Towing Capacity

The Allison 1000PK is known for its exceptional towing capabilities. It is often chosen for heavy-duty applications due to its strength and reliability when pulling heavy loads.

Durability and Longevity

The Allison 1000 series transmissions are renowned for their durability and can have a longer lifespan under heavy-duty use compared to some other transmissions, including the NV5600.

Smooth Shifting

The Allison 1000PK provides smooth and precise shifts, which can contribute to a more comfortable and enjoyable driving experience.

Fuel Efficiency

Some drivers may experience improved fuel efficiency with an automatic transmission like the Allison 1000PK due to its optimized shifting patterns.

Advanced Technology

The Allison 1000PK often features more advanced technology, including adaptive shift controls that adjust to driving conditions, resulting in optimized performance.

Reduced Wear on Other Components

Automatic transmissions can help reduce wear on associated drivetrain components, as the computer-controlled shifts can be more consistent and less stressful on the equipment than manual shifting.

Increased Vehicle Value

For some buyers, a vehicle with a well-regarded automatic transmission like the Allison 1000PK may have higher resale value due to its ease of use and strong reputation for reliability.

Versatility and Adaptability

The Allison 1000PK can be a great fit for a variety of applications, from daily driving to heavy-duty towing, making the vehicle more versatile.

Less Driver Fatigue

For long-haul or frequent drivers, an automatic transmission can result in less fatigue as it requires less constant attention and shifting effort compared to a manual transmission.

Compatibility with Various Powertrains

The Allison 1000PK has been used in a variety of setups, potentially offering more flexibility for engine swaps or other modifications.

What's included in an Allison Conversion kit?

We provide everything you will need to get the swap done right

Duramax with Allison Transmission
    • Kit Includes
    • Transmission
      Torque Converter
      Wiring Harness
      Flex Plate adapter
      Transfer Case
      Mounting Kit
      Cooling Kit
      Digital Display
      Allison TCM
      CAC TCM
Allison 1000PK Transmission

Allison 1000PK Transmission

Upgrade your vehicle's capabilities with the esteemed Allison 1000PK Transmission. You have the option to either include this component in your kit purchase or use your own pre-acquired Allison 1000PK transmission. To cater to your needs, we also provide transmission rebuilding services. Explore a comprehensive selection of other Allison transmissions here that we can expertly convert.

How to determine the Right Torque Converter

Maximizing Performance: Using Tire Diameter and Gear Ratio Calculations to Choose the Ideal Torque Converter

How to determine the right torque converter


Converting your Dodge Ram's transmission to an Allison can result in numerous benefits including improved durability, enhanced towing capability, increased fuel efficiency, and smoother gear shifts, thus optimizing your vehicle's performance.

Most Dodge Ram models can benefit from an Allison transmission conversion, but it's advisable to consult with a specialist to ensure compatibility with your specific model.

Yes, with the right adapters, your existing Dodge Ram transfer case can be utilized in an Allison conversion.

The Allison 1000 series is a popular choice for Dodge Ram vehicles due to its reliability and performance, but the best option depends on your particular needs and vehicle model.

The conversion process involves removing your Dodge Ram's current transmission, fitting the Allison transmission with the necessary adapters, and installing it. The wiring harness, TCM, and other components are also adjusted accordingly.

Yes, an Allison transmission is designed to provide smoother shifts, increased durability, and better fuel efficiency, all of which contribute to improved vehicle performance.

An Allison conversion kit typically includes components such as the transmission (if chosen), TCM, torque converter, wiring harness, adapters, and other necessary parts for the conversion.

You have the option to either provide your own Allison transmission or include it with your conversion kit purchase.

While it's possible for experienced individuals to do the conversion, it's generally recommended to hire a professional to ensure the job is done correctly and safely.

The conversion time can vary based on the vehicle and the specific conversion kit. On average, it might take a few days to complete.

An Allison conversion could affect your vehicle's warranty depending on the specific terms of your warranty agreement. We recommend checking with your warranty provider before proceeding with the conversion.

If you face any problems after the conversion, it's best to contact your conversion specialist for troubleshooting assistance or potential service needs.

Yes, an Allison transmission from another vehicle can be used, provided it's compatible with your Dodge Ram model. Ensure to consult with your conversion specialist before proceeding.

Yes, we do offer rebuilding services for Allison transmissions, ensuring your transmission is operating at peak performance.

The cost can vary significantly depending on the specific Allison model, whether you're providing the transmission or purchasing it as part of the kit, and any additional services required. Please contact us directly for a more precise estimate.

Rolling mountain scape

Financing Available

Financing is available, so that you can get on the road faster

3524 Garcon Point Road

Milton, FL 32583

(865) 253-1133