When your truck or SUV is built for serious work or play, the transfer case is the unsung hero of the drivetrain. It’s the component that reliably sends power to all four wheels, ensuring you have the traction needed to conquer tough jobs and tougher terrain. For those running a heavy-duty Atlas II or similar system, using the right parts and fluids is non-negotiable for maintaining peak performance and longevity.
This roundup is designed to help you find exactly what you need, whether you’re performing routine maintenance, a complete rebuild, or upgrading a scale model crawler. We’ve compiled a selection of fluids, replacement assemblies, repair kits, and model-specific components to keep your heavy-duty machine operating at its best. Finding a reliable solution for your specific application is the first step toward dependable four-wheel-drive performance.
Our Selection of Heavy-Duty Transfer Case Solutions
- Auto Trak II Transfer Case Fluid, 1.05 Quart GM Original Equipment
- Vanquish Products Atlas Transfer Case SCX10-II Black VPS08103
- Vanquish VPS08103 Atlas Transfer Case Black Axial SCX10-II
- Transfer Case Assembly Replacement for Nissan Murano 2015-2020 Pathfinder
- SamWinGear Shift Linkage Bushings Shift Control Lever 52105555AA
- RC4WD Advance Adapters Atlas Ii Transfer Case (1.47/1) Z-U0037
- NP231D New Process 231D Transfer Case for Jeep Wrangler TJ Cherokee XJ
- NP241 New Process 241 Transfer Case Rebuild Kit for Dodge Ram 2500 3500
Auto Trak II Transfer Case Fluid, 1.05 Quart GM Original Equipment
For GM vehicles equipped with an Auto Trak II system, using the correct fluid is critical for smooth operation and component protection. This GM Original Equipment fluid is formulated specifically to meet the demanding requirements of these transfer cases. It is engineered to provide consistent performance and help ensure trouble-free service from your four-wheel-drive system.
The distinctive blue fluid comes in a convenient 1.05-quart bottle, making it easy to handle for top-offs or complete fluid changes. Using this specified fluid helps maintain the proper function of the clutch packs and internal mechanisms, which is essential for the health of your entire drivetrain. For optimal performance, it’s always recommended to use the manufacturer’s specified fluids.
Vanquish Products Atlas Transfer Case SCX10-II Black VPS08103
Scale model enthusiasts looking to upgrade their Axial SCX10-II kit will appreciate this fully licensed Atlas transfer case from Vanquish Products. This component is designed as a direct upgrade, offering enhanced scale appearance and robust construction for your radio-controlled crawler. It brings the iconic look of the Advance Adapters Atlas transfer case to your detailed build.
The kit is commendable for its completeness, including all the additional hardware required for a straightforward installation into the SCX10-II chassis. This attention to detail saves time and ensures a proper fit, allowing you to focus on the build. It’s a premium part for hobbyists who demand accuracy and quality in their scale models.
Vanquish VPS08103 Atlas Transfer Case Black Axial SCX10-II
This is another listing for the highly detailed Vanquish Products Atlas transfer case, providing an authentic scale replica for your Axial SCX10-II. Like its counterpart, this model is built to the high standards that RC crawler builders have come to expect from Vanquish. The black finish gives it a professional, ready-for-action look that enhances any scale vehicle.
Designed for a direct fit, this transfer case serves as a core component for a realistic drivetrain. Its presence under the chassis significantly improves the model’s authenticity. For builders collecting parts for a new project or seeking a key upgrade, this transfer case is a solid choice that delivers on both form and function.
Transfer Case Assembly Replacement for Nissan Murano 2015-2020 Pathfinder
This is a complete transfer case assembly designed as a direct replacement for certain Nissan Murano, Pathfinder, and Infiniti QX60 models equipped with the 3.5L V6 engine. It is an essential solution for vehicles experiencing significant internal failure where a repair is not practical. The unit corresponds to OE part number 33100-3KA0B and other cross-references.
Compatibility is clearly listed for specific model years and trims, including both 2WD and AWD/4WD configurations from 2015 through 2022. Before purchasing, it is crucial to verify the part number on your original unit to ensure a correct fit. This assembly offers a comprehensive fix for restoring all-wheel-drive capability to your vehicle.
SamWinGear Shift Linkage Bushings Shift Control Lever 52105555AA
This repair kit addresses a common wear point on certain Dodge Ram trucks: the transfer case shifter linkage. The kit includes a shift control lever and grommet bushings designed to replace original part numbers 52105555AA and 68078974AA. Worn bushings in this system often lead to vague shifting or an inability to cleanly engage four-wheel-drive modes.
The components are constructed from high-quality aluminum and durable rubber, offering excellent durability and reliability under harsh conditions. This kit is compatible with 2002-2005 Dodge Ram 1500, 2500, and 3500 models equipped with the 241 and 271 transfer cases. It’s a cost-effective repair that can resolve frustrating shifting issues without replacing the entire assembly.
RC4WD Advance Adapters Atlas Ii Transfer Case (1.47/1) Z-U0037
RC4WD brings the legendary strength of the Advance Adapters Atlas II to the world of large-scale radio-controlled vehicles. This meticulously crafted scale model transfer case is built with a 1.47:1 gear ratio, mimicking the low-range capability of its full-size inspiration. It is engineered for performance and realism in demanding crawling applications.
The unit is constructed from machined metals and high-strength composites to handle the torque of powerful brushless motors. It’s a favorite among serious RC builders who need a transfer case that is both functionally robust and visually authentic. This component is a cornerstone for building a competition-level or highly detailed scale crawler.
NP231D New Process 231D Transfer Case for Jeep Wrangler TJ Cherokee XJ
The New Process 231, often called the “Command-Trac,” is a legendary transfer case found in millions of Jeeps and other 4x4s. This NP231D variant is a replacement unit compatible with Jeep Wrangler TJ and Cherokee XJ models. It is known for its simple, durable gear-driven design that provides reliable 2WD, 4WD High, and 4WD Low range options.
For owners of these classic vehicles, a replacement NP231D can be the most straightforward solution for a transfer case that is worn out, damaged, or making noise. These units are a direct fit for the original mounting points and driveline configurations, simplifying the replacement process. Sourcing a quality replacement is key to maintaining the off-road capability these vehicles are famous for.
NP241 New Process 241 Transfer Case Rebuild Kit for Dodge Ram 2500 3500
The NP241 transfer case is a workhorse found in many heavy-duty Dodge Ram trucks. Over time and with extensive use, internal components like seals, gaskets, bearings, and chains can wear out. This rebuild kit contains the necessary parts to overhaul and restore a worn NP241 unit to reliable service, which can be a more economical option than a full assembly replacement.
Such a kit is intended for those with the mechanical knowledge and tools to perform a complete teardown and reassembly of the transfer case. A successful rebuild requires careful work, but it can extend the life of your transfer case for many more miles. Using a comprehensive kit ensures you have all the common wear items on hand for the job.
Buying Guide: How to Choose the Best Atlas II Transfer Case for Heavy-Duty Use
When I’m building a rig meant for serious work or extreme trails, the transfer case is one component I never cut corners on. It’s the heart of a 4×4’s drivetrain, and for heavy-duty use, the Advance Adapters Atlas II is often at the top of my list. But not all Atlas II units are the same, and choosing the right one requires looking at a few key factors. Let me walk you through what I consider before making a purchase.
First, I always look at the gear ratio. The Atlas II comes in a few options, but the big ones are 3.0:1, 3.8:1, and the monster 5.0:1 low range. If my primary use is crawling over brutal, technical terrain with large tires, the 5.0:1 is a game-changer. It provides insane wheel torque at a super-slow crawl, giving me impeccable control. For a more mixed-use rig that sees high-speed trail riding and some crawling, the 3.8:1 is a fantastic and popular middle ground. The 3.0:1 is great if I’m coming from a stock case and want a solid upgrade without going too extreme.
Next, I have to decide on the number of outputs. This is the 2-Wheel Drive vs. 4-Wheel Drive only choice. The 4WD-only version is simpler, lighter, and often stronger because it has one less output shaft to potentially fail. I’d choose this for a dedicated trail rig. However, if my truck is a daily driver or sees a lot of pavement, the 2WD option is non-negotiable for saving wear on the front drivetrain and improving fuel economy on the highway.
The input and output configurations are also critical. The Atlas II is famous for its clocking options, allowing me to tilt the case to gain precious ground clearance for the drivelines. I also need to make sure I’m selecting the correct input spline count and length to match my transmission, and the right output flanges to connect to my front and rear driveshafts. Getting this wrong means it simply won’t bolt in. I always double-check my transmission model and year.
Finally, I think about the little things that make a big difference. The twin-stick shifters give me the ultimate flexibility to run in front-wheel-drive-only or rear-wheel-drive-only, which is incredibly useful for maneuvering in tight spots or if I break a driveshaft. I also consider the cost of the complete kit. While the Atlas II is a premium product, I factor in whether I need a new crossmember, shifter handles, or driveshaft modifications. Getting the right Atlas II transfer case for heavy-duty use from the start saves me a huge amount of time, money, and frustration down the trail.
FAQ
What makes the Atlas II stronger than a stock transfer case?
The difference is in the construction. Stock cases, like a NP231, are often made with a magnesium or aluminum housing and use a chain-driven system. The Atlas II features a massive cast-iron housing that is practically indestructible under normal stress. Internally, it uses a gear-to-gear design, which is significantly stronger than any chain and eliminates the risk of the chain stretching or snapping under high torque loads. Every component inside is built to handle the punishment that comes with large tires and extreme angles.
Can I install an Atlas II transfer case myself?
This is a complex job that requires mechanical skill, specialty tools, and a good amount of patience. You’ll need a way to safely support the transmission and transfer case during removal and installation. It involves disconnecting driveshafts, shift linkages, and possibly your transmission crossmember. You also need to be precise with the clocking angle and shifter linkage adjustment. If you’re comfortable with major drivetrain work, it’s a very rewarding project. If not, I strongly recommend having a professional shop with 4×4 experience handle the installation.
Is the 5.0:1 gear ratio too low for my vehicle?
It can be, depending on your setup and how you drive. The 5.0:1 ratio is incredibly low. When combined with a deep axle ratio (like 5.13s), it can make first gear virtually unusable on anything but the steepest, slowest crawls. It’s perfect for a dedicated rock crawler on 40-inch+ tires. However, for a rig that sees any kind of trail running where you need to maintain a bit more speed, the 3.8:1 ratio is usually a better and more versatile choice. You need to match the transfer case ratio to your tire size, axle gears, and engine power.
What is the main difference between the Atlas II and the newer Atlas IV?
The biggest difference is the shift mechanism. The Atlas II uses a traditional “twin-stick” design with two separate levers to control the front and rear outputs independently. The newer Atlas IV uses a single-lever, electronic shift-on-the-fly system that can feel more like a modern stock transfer case. The Atlas IV offers some convenience, but many hardcore wheelers, including myself, prefer the absolute mechanical simplicity and redundancy of the Atlas II’s twin-stick system. There are fewer electronics to fail on the trail. For the ultimate in heavy-duty use, the Atlas II remains a top-tier choice.
Do I need to modify my driveshafts when upgrading to an Atlas II?
In almost every case, yes, you will. The Atlas II has a different physical size and output flange pattern compared to most stock transfer cases. This changes the required length of your front and rear driveshafts. You will likely need to have your existing driveshafts shortened or lengthened, and the yokes replaced to match the new Atlas flanges. It’s a cost you should definitely include in your overall budget for the swap. Trying to reuse unmodified stock driveshafts is usually not an option.