Advance Adapters Atlas 2 Speed Trail Series Transfer Case - 2007-2018 Jeep Wrangler JK Manual Transmission

The Advance Adapters Atlas 2 Speed Trail Series Transfer Case for 2007-2018 Jeep Wrangler JK with manual transmission is the ultimate gear-driven transfer case upgrade engineered specifically for the NSG370 6-speed manual transmission. This JK-specific Atlas features a 23 spline input shaft designed to bolt directly to the NSG370 transmission found in all 2007-2018 JK Wranglers with manual transmission, eliminating the weak factory NP241 transfer case with legendary Atlas strength and reliability.

2007-2018 JK Manual Transmission Universal Application: This Atlas transfer case is purpose-built for 2007-2018 Jeep Wrangler JK models equipped with the NSG370 6-speed manual transmission. Unlike automatic transmission JK Wranglers which have different transmission configurations across model years, all JK manual transmission models from 2007 through 2018 use the same NSG370 transmission with a 23 spline output shaft, making this Atlas transfer case a direct bolt-in upgrade for the entire eleven-year production run.

NSG370 Transmission Compatibility: The NSG370 manual transmission used in JK Wranglers is a robust 6-speed gearbox manufactured by Mercedes-Benz with gear ratios of 4.459, 2.614, 1.723, 1.200, 1.000, 0.838 and reverse 4.06. With a 272 foot-pound input torque capacity and output torque limits between 1100-1300 foot-pounds, the NSG370 is an ideal match for the Atlas transfer case. The transmission features a 23 spline output shaft that bolts directly to the Atlas using the standard Jeep 6-bolt transfer case mounting pattern for driver's side drop transfer cases.

Complete Bolt-In Package for JK Wrangler Manual: Unlike universal Atlas transfer cases that require extensive custom fabrication, this JK-specific Atlas 2 Speed is designed to bolt into your 2007-2018 Wrangler JK manual transmission Jeep with proper fitment and includes all necessary components for a complete installation. The package includes the complete transfer case assembly with 23 spline input shaft, sight tube for easy fluid level inspection, cable shifters specifically configured for JK console installation, front and rear yokes compatible with JK driveshafts, all necessary electronics and speed sensors for Jeep computer integration, complete warranty coverage, detailed installation instructions specific to JK Wrangler, and Redline 75W-90 GL4 transfer case oil.

Why Upgrade from Factory NP241 Transfer Case: The factory NP241 transfer case in 2007-2018 JK Wranglers uses a chain-driven design with a 2.72:1 low range ratio. While adequate for stock applications, the NP241 suffers from chain stretch under heavy loads, chain failure especially with larger tires and increased torque, weak aluminum case prone to cracking under extreme use, limited low-range gearing options with no ability to change ratios, inability to select front or rear axle independently in low range, and overall weakness when subjected to serious off-road use. The Atlas 2 Speed eliminates every weakness of the factory transfer case with all gear-driven construction that eliminates chain failures entirely, multiple low-range ratio options from 3.0:1 to 5.0:1, bulletproof 356-T6 heat-treated aluminum case, synchronized shift-on-the-fly capability, independent front and rear axle control in low range, and proven strength handling over 900 foot-pounds of torque.

Trail Series Specifications: The Atlas 2 Speed Trail Series represents the versatile, all-purpose solution for daily drivers and weekend trail rigs. With the 1.25 inch idler gear design, the Trail Series delivers exceptional strength while maintaining smooth on-road operation.

• Series: Trail Series (1.25 inch idler gear design)
• Speeds: 2-Speed (High Range 1:1 and Low Range)
• Available Gear Ratios: 3.0:1, 3.8:1, 4.3:1, 5.0:1
• Input Shaft: 23 spline (NSG370 6-speed manual transmission)
• 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 (included)
• Construction: All gear-driven, zero chain design
• Torque Capacity: Over 900 foot-pounds
• Made in USA

Independent Front and Rear Axle Control: One of the most significant advantages of the Atlas transfer case over the factory NP241 is the ability to select front or rear axle only in low range. This feature provides incredible versatility including rear axle only low range for better power delivery, higher RPM, and easier steering by eliminating front axle binding, front axle only low range for racing applications or unique situations, the ability to crawl with just rear power for improved steering response on technical obstacles, and synchronized shifting allowing you to shift into low range 4-wheel drive whenever needed without stopping.

Available Gear Ratios Explained:

3.0:1 Ratio - The perfect all-around ratio for JK Wranglers running 35-37 inch tires with the NSG370 manual transmission. The 3.0:1 ratio provides excellent low-range torque multiplication while maintaining reasonable crawl speeds. Works exceptionally well with the factory 3.8L or 3.6L Pentastar V6 engine, keeping engine RPM in the powerband during technical terrain. The manual transmission provides excellent control at crawl speeds with this ratio. Ideal for weekend trail riders who split time between highway driving and moderate to difficult rock crawling.

3.8:1 Ratio - Increased crawling capability for serious rock crawling and steep climbs. The 3.8:1 ratio is the sweet spot for JK Wranglers with 37-40 inch tires and the NSG370 manual. Delivers strong low-range torque while keeping the engine in its optimal power range on steep grades. The manual transmission combined with 3.8:1 gearing provides exceptional throttle control for technical obstacles. Popular choice for built JK Wranglers with manual transmission tackling challenging trails like Moab, Rubicon Trail, and technical East Coast rock gardens.

4.3:1 Ratio - Serious low-range gearing for extreme rock crawling and ultra-slow technical terrain. Recommended for heavily built JK Wranglers with 40-42 inch tires, heavy armor, and significant weight. The 4.3:1 ratio combined with the NSG370 manual transmission provides exceptional torque multiplication for the most challenging obstacles while maintaining precise throttle control at crawl speeds through clutch modulation. Perfect for competition rock crawling and the most extreme terrain.

5.0:1 Ratio - Maximum crawl ratio for the slowest technical terrain and competition use. The 5.0:1 ratio is designed for extreme builds with 42+ inch tires, full armor, winches, and maximum weight. The NSG370 manual transmission paired with 5.0:1 gearing delivers unmatched low-speed control and torque delivery for King of the Hammers-level terrain and professional rock crawling competition. The manual transmission allows incredibly precise throttle control at near-idle speeds with this ultra-low gearing.

Manual Transmission Advantages with Atlas: JK Wranglers with the NSG370 manual transmission gain significant benefits when paired with the Atlas transfer case. The manual transmission allows precise clutch modulation for ultra-slow crawling, the driver has complete control over engine RPM and power delivery, first gear combined with Atlas low range provides incredible torque multiplication, there are no computer programming requirements like automatic transmission JKs, the manual transmission provides engine braking on descents, and the simplicity of the manual drivetrain eliminates the complexity and potential issues of automatic transmission electronics.

Gear-Driven Atlas Advantage: The Advance Adapters Atlas revolutionized transfer case design by eliminating the weak chain-driven architecture used in factory transfer cases. The all gear-driven design uses massive helical-cut gears supported by needle bearing elements and precision-matched 8620 steel shafts. This construction delivers quiet operation, shift-on-the-fly capability, and bulletproof reliability under extreme loads that would destroy chain-driven transfer cases.

Construction and Engineering Excellence: The solid one-piece case design is manufactured from 356-T6 heat-treated aluminum alloy, the same aerospace-grade material used in the structural access cover and all exterior components. Heavy-duty planetary gears feature BorgWarner synchronizers for smooth shifting under load, something impossible with chain-driven transfer cases. The synchronized design allows shifting in and out of all ranges without stopping, a dramatic improvement over the factory NP241. Ruggedly designed output shafts are supported by large taper bearing sets for maximum durability under extreme torque loads.

JK-Specific Installation Considerations: The Atlas 2 Speed is approximately 2.5 inches longer than the factory NP241 transfer case. This additional length typically requires rear driveshaft shortening and may require front driveshaft modification or replacement. Most 2007-2018 JK manual transmission installations are completed without body lifts, though a body lift can provide additional clearance for exhaust and crossmember modifications. The JK uses flange-style yokes on the stock NP241, and the stock driveshafts feature a long slip yoke to compensate for different drivetrain lengths. These stock driveshafts need to be replaced with custom shortened driveshafts. Professional driveline shops can properly shorten and balance driveshafts to ensure smooth operation at all speeds.

Cable Shifter Configuration: This Atlas transfer case comes configured with cable shifters specifically designed for Jeep JK installation. The cable shifter system was engineered by Advance Adapters to fit the stock JK console and uses the stock access hole in the floorboard for routing new cables, making for a clean and easy installation. The shifter provides independent control of front and rear axle engagement through twin stick operation, giving you complete control over your drivetrain configuration. The cable design allows flexible mounting and eliminates complex linkage fabrication.

Speedometer and Electronics Integration: The Atlas includes all necessary electronics and speed sensors for proper integration with JK Wrangler computer systems. Electronics kit 300377A allows the JK to retain all stock functions including speedometer accuracy, dashboard indicator lights, and warning systems. The transfer case interfaces with the factory vehicle speed sensor system to maintain accurate speedometer readings. Unlike automatic transmission JKs which require transmission control module programming, manual transmission JK Wranglers do not require any computer flashing or programming when installing the Atlas, significantly simplifying the installation process.

What's Included with Your Atlas: Every Atlas 2 Speed for 2007-2018 JK manual transmission includes the complete transfer case assembly with 23 spline input shaft specifically for NSG370 transmission, sight tube for easy fluid level inspection, cable shifters pre-configured for JK console installation with all mounting hardware, front and rear yokes compatible with custom JK driveshafts, all necessary electronics and speed sensors (kit 300377A), complete warranty documentation, detailed installation instructions specific to JK Wrangler manual transmission, and Redline 75W-90 GL4 transfer case oil.

Custom Built-to-Order Process: Each Atlas transfer case is custom built to order by Advance Adapters in their Paso Robles, California facility. After placing your order through Skinny Pedal Racing, you will be contacted by technical specialists to confirm your specific configuration including verification of your 2007-2018 JK with NSG370 manual transmission, desired gear ratio selection based on your tire size and intended use, output shaft drop direction confirmation, yoke configuration verification for your driveshaft setup, and any special requirements for your build.

Typical Build Lead Time: Due to high demand and the custom nature of Atlas transfer cases, current lead times are 6-7 weeks from order confirmation to shipment. This build time ensures each Atlas is manufactured to exact specifications and thoroughly tested before leaving the factory. The wait is worth it for a transfer case that will last the lifetime of your Jeep.

Installation Professional Recommendation: While experienced home mechanics with manual transmission knowledge can install the Atlas transfer case, we recommend professional installation by a qualified Jeep performance shop familiar with JK drivetrain modifications. Professional installation ensures proper driveshaft modifications and balancing, correct transfer case alignment and mounting, proper fluid levels and break-in procedure, and verification of all electronic integration. The cable shifter installation requires removing the center console but is straightforward with the provided instructions.

Legendary Atlas Durability and Reputation: Since 1995, the Advance Adapters Atlas has established an unmatched reputation for strength, reliability, and performance. With over 30,000 units sold worldwide, the Atlas has proven itself from daily driver Jeeps to King of the Hammers competition vehicles. Many original Atlas transfer cases from 1995 remain in service today, testament to their precision engineering and bulletproof construction. The Atlas is the gold standard in aftermarket transfer cases and is widely regarded as the ultimate upgrade for serious Jeep enthusiasts.

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 is designed for competition racing and extreme high-performance applications where maximum strength is required.

Atlas 4-Speed Also Available: For JK Wranglers with manual transmission, the Atlas 4-Speed is also available and provides three separate low-range functions instead of a single low range. This gives many more options for different terrain types. The 4-speed is approximately 6 inches longer than the 2-speed and requires additional clearance. Most JK owners choose the 2-speed as it provides all the capability needed for serious off-roading without the additional length and complexity of the 4-speed.

Why Choose Skinny Pedal Racing: Skinny Pedal Racing specializes in high-performance drivetrain components for Jeep Wrangler enthusiasts. We work directly with Advance Adapters to ensure your Atlas transfer case is configured correctly for your specific 2007-2018 JK manual transmission application. Our technical specialists have extensive experience with JK Atlas installations and can guide you through the entire process from initial order to post-installation support.

Warranty and Support: Every Atlas transfer case includes comprehensive warranty coverage backed by Advance Adapters. The warranty covers manufacturing defects and material failures when the transfer case is used as intended. Detailed warranty information is included with each transfer case. Advance Adapters stands behind their products with industry-leading support.

The Atlas Transformation: Installing an Atlas 2 Speed Trail Series transfer case transforms your 2007-2018 Jeep Wrangler JK manual transmission's off-road capability. Experience the difference of true gear-driven strength that eliminates chain failures, synchronized shifting under load for seamless operation, independent front and rear axle control for maximum versatility, multiple low-range options for any terrain from mild to extreme, bulletproof reliability you can trust in the most demanding conditions, and legendary Atlas performance proven by over 30,000 satisfied customers worldwide.

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 of performance and reliability. Supporting American manufacturing while getting the absolute best transfer case available.

Order Your JK Manual Transmission Atlas Transfer Case: Upgrade your 2007-2018 Jeep Wrangler JK manual transmission with the industry-leading Atlas 2 Speed Trail Series transfer case from Skinny Pedal Racing. Contact us to discuss your specific application and let our experts help you select the perfect gear ratio for your tire size and wheeling style. Transform your JK's capability with Atlas strength, reliability, and legendary performance.