The Advance Adapters Atlas 2 Speed Trail Series Transfer Case is the industry-leading gear-driven transfer case engineered for serious off-road performance while maintaining excellent on-road manners. Since 1995, the Atlas 2 has established a legendary reputation as the ultimate upgrade for rock crawling, trail riding, desert racing, and extreme off-road terrain.
The Atlas Trail Series is the versatile, all-purpose solution designed for daily drivers and weekend trail rigs. With over 30,000 units sold worldwide, the Atlas 2 Speed has proven its bulletproof design and uncompromising reliability in the harshest conditions from King of the Hammers to remote backcountry trails.
Trail Series Specifications:
- Series: Trail Series (1.25 inch idler gear design)
- Speeds: 2-Speed (High and Low Range)
- Available Gear Ratios: 3.0:1, 3.8:1, 4.3:1, 5.0:1
- Case Material: 356-T6 heat-treated aluminum alloy
- Weight: 110 pounds dry
- Fluid Capacity: 2.0 quarts (1.98 liters)
- Recommended Fluid: Redline 75W-90 GL4
- Construction: All gear-driven, zero chain design
- Made in USA
Built-to-Order Custom Configuration: Every Atlas Trail Series transfer case is custom built to order by Advance Adapters in the USA. You select the perfect configuration for your specific vehicle and driving style including gear ratio, input shaft spline count, output shaft drop (left or right), tail housing length, speedometer output type, and shifter style.
Why the Atlas Dominates: The Atlas 2 Speed revolutionized the transfer case industry by eliminating the weak chain-driven design used in factory transfer cases. The all gear-driven design delivers unmatched strength, reliability, and smooth operation. Massive helical-cut gears supported by needle bearing elements and precision-matched 8620 steel shafts ensure quiet operation and shift-on-the-fly capability.
Construction and Engineering Excellence: The solid one-piece case design is manufactured from 356-T6 heat-treated aluminum alloy, the same material used in the structural access cover and all exterior components. Heavy-duty planetary gears feature BorgWarner synchronizers for smooth shifting under load. Ruggedly designed output shafts are supported by large taper bearing sets for maximum durability.
Performance Advantages: The Atlas Trail Series delivers the perfect balance of street-ability and off-road prowess. The synchronized independent front and rear drive shifting allows you to crawl with absolute control or climb with full torque delivery. Shift-on-the-fly capability means you can engage 4-wheel drive at highway speeds without stopping.
Available Gear Ratios Explained:
3.0:1 Ratio - The perfect all-around ratio providing excellent low-range torque multiplication while maintaining reasonable highway speeds in low range. Ideal for vehicles with larger tires (35-37 inches) and moderate power. Best for trail riders who split time between highway driving and technical terrain.
3.8:1 Ratio - Increased crawling capability for technical rock crawling and steep climbs. Excellent choice for vehicles with 37-40 inch tires. Provides strong low-range torque while keeping engine RPM in the powerband on steep grades.
4.3:1 Ratio - Serious low-range gearing for extreme rock crawling and ultra-slow technical terrain. Recommended for vehicles with 40+ inch tires or heavy builds requiring maximum crawl control. Delivers exceptional torque multiplication for the most challenging obstacles.
5.0:1 Ratio - Maximum crawl ratio for the slowest technical terrain and heaviest vehicles. The ultimate choice for extreme rock crawling, competition use, and vehicles with 42+ inch tires. Provides unmatched low-speed control and torque delivery.
Vehicle Applications: The Atlas 2 Speed Trail Series is compatible with a wide range of 4x4 vehicles through custom input/output configurations and transmission adapters:
Jeep Applications: Wrangler TJ (1997-2006), Wrangler LJ (2004-2006), Wrangler JK (2007-2018), Wrangler JL (2018+), Gladiator JT (2020+), Cherokee XJ (1984-2001), CJ-5 (1972-1983), CJ-7 (1976-1986), CJ-8 Scrambler (1981-1985), Comanche MJ (1986-1992)
Ford Applications: Bronco (1966-1996), F-Series 4WD Trucks (1967-1997), Ranger 4WD
Toyota Applications: Land Cruiser, FJ40, FJ60, FJ80, Tacoma, 4Runner, Pickup
Other Applications: Chevrolet, GMC, Dodge, International Scout, and custom builds
Transmission Compatibility: Works with various transmissions using Advance Adapters bearing housing adapter kits including Ford C4, Ford C6, Ford AOD, Ford 6R80, Ford 10R80, Turbo 350, Turbo 400, NP435, T-18, T-98, NV3550, NV4500, AX-15, NSG370, and many others.
Shifter Options: Choose from multiple shifter configurations including twin stick shifters for independent front and rear axle control or cable-operated shifters for vehicles requiring remote mounting. Standard configurations include appropriate shifters for specific vehicle applications.
Speedometer Options: Multiple speedometer output options available including mechanical cable drive for stock speedometers, electronic speed sensor outputs for fuel-injected vehicles, and adapter kits for digital dash integration.
Installation Considerations: The Atlas 2 is approximately 2.5 inches longer than most factory transfer cases such as the Dana 18, Dana 20, Dana 300, or NP231. This may require driveshaft modifications including rear driveshaft shortening and potential front driveshaft lengthening. Some applications may benefit from a body lift for additional clearance, though many installations are completed without body lifts.
What Makes Atlas Different: While factory transfer cases use weak chain-driven designs that stretch, break, and require frequent maintenance, the Atlas uses all gear-driven construction. No chains to stretch, no plastic components to break, no weak points to fail. The synchronized gear design allows smooth shifts under load, something impossible with chain-driven cases.
Legendary Durability: Many original Atlas transfer cases from 1995 remain in service today, testament to their precision engineering and bulletproof construction. The Atlas has won over the off-road industry for superior performance and the ability to handle anything from daily driving to King of the Hammers competition.
Professional Grade Components: Heavy-duty planetary gears, helical-cut gear teeth, needle bearing and taper roller bearings, BorgWarner synchronizers, heat-treated aluminum housings, precision-machined 8620 steel shafts, and aircraft-quality fasteners ensure the Atlas delivers professional-grade performance and reliability.
Trail Series vs G2 Pro Series: The Trail Series features a 1.25 inch idler gear design optimized for daily drivers and weekend trail use with gear ratios from 3.0:1 to 5.0:1. The G2 Pro Series (sold separately) features a 1.5 inch idler, 300M output shafts, super-finished gears, and additional low-range ratios (1.5:1 and 2.0:1) designed for competition racing and high-performance applications.
Custom Built Process: After ordering, Skinny Pedal Racing will contact you to confirm your specific configuration requirements including your vehicle year/make/model, transmission type, desired gear ratio, output shaft drop direction, tail housing requirements, speedometer needs, and shifter preferences. This ensures your Atlas is built exactly right for your application.
Maintenance: The Atlas requires minimal maintenance. Check fluid level periodically and change fluid every 30,000-50,000 miles. Inspect seals and gaskets for leaks during routine service. Ensure shift linkage is properly lubricated and functioning smoothly. The gear-driven design eliminates chain maintenance entirely.
Why Choose Atlas from Skinny Pedal Racing: Skinny Pedal Racing specializes in high-performance drivetrain components for serious off-road enthusiasts. We work directly with Advance Adapters to ensure your Atlas transfer case is configured correctly for your specific application. Our technical specialists review every order to confirm specifications before your Atlas leaves the building.
The Atlas Advantage: The Advance Adapters Atlas 2 Speed Trail Series Transfer Case transforms your vehicle's off-road capability. Experience the difference of true gear-driven strength, synchronized shifting under load, bulletproof reliability, and legendary Atlas performance. From technical rock crawling to high-speed desert running, the Atlas delivers uncompromising capability.
Made in USA: Every Atlas transfer case is designed, engineered, and manufactured by Advance Adapters in Paso Robles, California. American craftsmanship, precision CNC machining, and rigorous quality control ensure every Atlas meets the highest standards.
Order your custom-built Advance Adapters Atlas 2 Speed Trail Series Transfer Case from Skinny Pedal Racing. Contact us to discuss your specific application and let our experts help you configure the perfect Atlas for your build.
CASE: Material: 356-T6 Heat Treated Aluminum Weight: 110 lbs. (dry)
INTERNAL COMPONENTS: Gears: Helical Cut Bearings: Needle & Taper Rollers
Synchronizers: Borg Warner
Available Input Shaft Splines: 10, 21, 23, 27, 28, 29, 31, 32, 34, 35
Tail Shaft: H.D., 32 Spline, Optional 300M output also available
Front Output: 32 Spline
RATIOS: Low Range: 3.0:1 or 3.8:1 or 4.3:1 or 5.0:1.
Gear sets are offered with a 1.25" idler which is our "Trail Series" The Atlas Trail Rated case is our standard application Atlas for most stock vehicles.
Gear sets are offered with a 1.5" idler which is our "G2/G3 Pro Rated". The Atlas G2 Pro Rated case is designed for Race competition vehicles. The case has a 300M output shaft and super finished gears. This case is race-proven and excels in short courses as well as K.O.H.
High Range 1:1
TEMPERATURE: Normal Operating Temperature : 160F - 175F Degrees
Intermittent High Horsepower : 190F - 220F Degrees
Max Temperature : 230F - 240F Degrees
Sales tax applies, and we will contact you for approval. Each Atlas is built to order by Advance Adapters.