Fits 1984-2001 Jeep Cherokee XJ.

Eliminate driveline vibrations and correct pinion angles on your lifted Cherokee with the Zone Offroad 1-inch transfer case drop kit. Increasing suspension height on an XJ often results in steep driveshaft angles that cause shuddering during acceleration. This system repositions the factory crossmember lower to restore geometry and reduce stress on U-joints.

Designed specifically for vehicles equipped with 3-inch to 5-inch lift kits, this bolt-on solution includes high-strength spacers and the necessary extended hardware for a precise fit. The kit (ZONJ5006) comes complete with thread locker to ensure all fasteners remain secure under trail conditions.

• Reduces driveline angles to eliminate unwanted vibration
• Engineered for use with 3" to 5" suspension lifts
• Includes spacers, extended Grade 8 hardware, and thread locker
• Simple bolt-on installation using factory mounting points
• Manufacturer Part Number: ZONJ5006

Fits select 1999-2022 Ford F-250 and F-350 Super Duty models.

Restore proper driveline geometry on your lifted Super Duty with the Zone Offroad carrier bearing drop kit (ZONF5401). This kit is designed specifically for trucks equipped with a 2-piece rear driveshaft to eliminate high-speed vibrations caused by increased suspension height. By lowering the carrier bearing, it repositions the shaft to mimic factory operating angles, ensuring smooth power delivery and reduced wear on U-joints.

Constructed from heavy-duty steel and finished in a durable black powder coat, this kit is built to withstand the rigors of heavy towing and off-road use. Each kit includes all necessary mounting hardware for a straightforward bolt-on installation.

• Eliminates rear driveline vibrations on lifted applications
• Corrects rear driveshaft angles for trucks with 2-piece driveshafts
• Durable steel construction with a corrosion-resistant powder-coated finish
• Direct bolt-on installation into factory mounting points
• Complete kit includes all required mounting hardware
• Manufacturer Part Number: ZONF5401

Fits select 2009-2025 Ford F-150 and 2013-2022 Ram 2500/3500 trucks. This Zone Offroad carrier bearing drop kit is engineered to eliminate driveline vibrations in lifted trucks by correcting rear driveshaft angles. On vehicles equipped with a two-piece rear driveshaft, lifting the suspension increases the operating angle at the carrier bearing; this kit realigns the component to maintain smooth power delivery and prevent premature wear on U-joints and seals.

• Adjustable design allows for a 1/8-inch to 2-inch drop to precisely fine-tune rear driveline angles.
• Heavy-duty steel construction provides long-lasting structural integrity.
• Dual-layered protection featuring both zinc plating and a black powder-coated finish for superior corrosion resistance.
• Easy-to-install bolt-on design for a straightforward upgrade.
• Includes all necessary mounting hardware for a complete installation.
• Manufacturer Part Number: ZOND5406

Fits 1994-2001 Dodge Ram 1500 4x4 models.

The Zone Offroad Posi-Lok system replaces the failure-prone OEM vacuum-actuated Central Axle Disconnect (CAD) system used to engage the front differential. Vacuum systems are notorious for leaking, failing due to age, or becoming disconnected during off-road use, often leaving you without 4WD when you need it most. This manual cable-operated conversion gives the driver direct, mechanical control over the front axle engagement from inside the cab.

Built for reliability in harsh environments, the Posi-Lok system eliminates the guesswork of vacuum-operated hubs and actuators. It allows for more precise control, including the ability to engage the transfer case in 4WD Low while keeping the front axle disengaged for 2WD Low-range maneuverability.

• Replaces unreliable OEM vacuum actuator (CAD) system
• Provides direct manual engagement of the front differential
• Heavy-duty cable construction for long-term durability
• Includes dash-mounted engagement knob and necessary hardware
• Manufacturer Part Number: PSL400

Fits select 1998-2009 Buick, Cadillac, Chevrolet, Chrysler, Dodge, GMC, Isuzu, and Ram vehicles.

The Yukon Gear Transfer Case Rear Seal is a precision-engineered replacement component designed to prevent fluid leaks at the rear output shaft of your drivetrain. This seal ensures that transfer case lubricant remains contained, protecting internal gears and bearings from heat and friction damage caused by low fluid levels. Manufactured to meet or exceed original equipment specifications, it provides a reliable, direct-fit solution for maintaining your vehicle's New Process or New Venture transfer case.

• Direct replacement for the rear output shaft seal to stop or prevent leaks
• Compatible with NP126, NP136, NP146, NP236, NP246, NP261, and NP263 transfer case models
• Helps maintain critical lubrication levels for drivetrain longevity
• Built with durable materials to withstand the temperature and chemical demands of transfer case fluid
• Manufacturer Part Number: ZTSEA22507TTO

Fits select 2003-2014 Nissan Frontier, Pathfinder, Titan, and Xterra models equipped with the M226 rear differential.

The USA Standard Gear Master Overhaul Kit is a comprehensive rebuild solution designed to provide all the precision components required to service or upgrade your differential. This kit (MPN ZK NM226) is engineered specifically for the Nissan M226 rear axle, replacing worn factory components with high-quality bearings and seals to restore drivetrain integrity and quiet operation. Each kit is the result of extensive research to ensure exact compatibility and a complete component set for the professional installer or DIY enthusiast.

• Features premium Koyo bearings and races for durability and reduced friction
• Complete shim kit included for precise backlash and pinion depth adjustment
• Replacement pinion seal, pinion nut, and crush sleeve for a leak-free seal
• Includes ring gear bolts, oil baffles, and slingers
• Installation supplies included: thread locker, marking compound with brush, silicone, and gasket
• Manufacturer Part Number: ZK NM226

Fits select 1999-2008 Buick, Cadillac, Chevrolet, and GMC vehicles with the GM 8.6-inch differential.

The USA Standard Gear Master Overhaul Kit (ZK GM8.6) provides a comprehensive solution for technicians and owners performing a ring and pinion installation or a complete differential rebuild. This kit eliminates the guesswork of sourcing individual components by providing everything required to set pinion depth, preload, and backlash accurately during assembly.

Built for durability and quiet operation, this master kit features premium Koyo bearings and races. These components are selected for their precision tolerances, ensuring your drivetrain maintains structural integrity under load. From the specific pinion seal to the included thread locker, every part is engineered to help you finish the job with professional results.

• Manufacturer Part Number: ZK GM8.6
• High-quality Koyo bearings and races
• Pinion seal and pinion nut
• Complete shim kit for precise gear pattern adjustment
• Crush sleeve and ring gear bolts
• Differential gasket
• Installation supplies: Thread locker, marking compound, and applicator brush

Professional-grade differential rebuilding starts with the USA Standard Gear Master Overhaul Kit (ZK GM8.5-HD). Engineered for select 1970-2003 GM vehicles equipped with an 8.5-inch rear differential and an aftermarket HD Positraction unit or locker, this kit eliminates the guesswork by providing every component required for a complete setup.

This kit features premium Koyo and Timken bearings and races, ensuring exact tolerances and long-term reliability. It is specifically designed to accommodate the slightly different bearing requirements of heavy-duty aftermarket carriers. Whether you are performing a gear swap or refreshing a worn differential, this kit includes the shims, seals, and hardware needed to achieve the correct pinion depth and carrier preload for a quiet, durable gear pattern.

• Fits GM 8.5-inch rear differentials with aftermarket Positraction or locker units
• Uses high-quality Koyo/Timken bearings and races for reduced friction and heat
• Comprehensive shim kit for precise ring and pinion alignment
• Includes pinion seal, pinion nut, and crush sleeve
• Includes ring gear bolts and differential gasket
• Supplied with thread locker, marking compound, and application brush
• Manufacturer Part Number: ZK GM8.5-HD

Fits select 1970-2003 Buick, Cadillac, Chevrolet, Oldsmobile, and Pontiac vehicles with the GM 8.5-inch rear differential. This comprehensive kit provides all the essential components required for a complete differential rebuild or gear ratio change.

The USA Standard Gear Master Overhaul Kit is engineered to provide a reliable solution for restoring differential performance. By using high-quality Koyo and Timken bearings and races, this kit ensures proper tolerances and longevity under load. It eliminates the guesswork of sourcing individual parts by consolidating everything from the crush sleeve to the marking compound into one package (MPN: ZK GM8.5).

• Koyo/Timken carrier bearings and races
• Pinion bearings and races
• Specific GM 8.5" pinion seal
• Complete shim kit for precise backlash and pinion depth adjustment
• High-strength ring gear bolts
• New pinion nut and crush sleeve
• Thread locker and gear marking compound with applicator brush
• Differential cover gasket included

Fits select 1999-2015 Chevrolet and GMC trucks and vans equipped with the 10.5" 14-bolt rear differential. This master overhaul kit is engineered for professionals and DIY installers who need a comprehensive, single-box solution for a complete differential rebuild or gear ratio change.

USA Standard Gear Master Overhaul Kits are built around high-quality Koyo and Timken bearings and races to ensure optimal preload and long-term durability. This kit eliminates the need to source individual small parts, providing everything required to set pinion depth and backlash with precision. The inclusion of a complete shim kit and marking compound allows for an accurate contact pattern check, ensuring a quiet and reliable drivetrain.

• Features premium Koyo/Timken bearings and races for reduced friction and heat.
• Comprehensive component list to handle full teardowns and reassemblies.
• Specific fitment for the heavy-duty GM 10.5-inch 14-bolt rear end.
• Manufacturer Part Number: ZK GM14T-C

Kit Includes: Carrier bearings and races, pinion bearings and races, pilot bearing, pinion seal, complete shim kit, pinion nut, crush sleeve, thread locker, marking compound with brush, and housing gasket.

Fits select 2001-2010 Chevrolet Silverado 2500/3500, GMC Sierra 2500/3500, and Dodge Ram 2500/3500 with the 11.5-inch AAM rear differential.

This USA Standard Gear Master Overhaul Kit provides every component required to perform a professional differential rebuild or gear installation. Designed to eliminate the guesswork of sourcing individual parts, this kit is centered around high-grade Koyo/Timken bearings and races to ensure long-term reliability and proper mesh under heavy towing and hauling loads. Whether you are addressing bearing noise or upgrading your ring and pinion set, this comprehensive package provides the precision shims and hardware needed to set your backlash and pinion depth correctly.

• Manufacturer Part Number: ZK GM11.5
• Differential Fitment: American Axle Manufacturing (AAM) 11.5"
• Bearings Included: High-quality Koyo/Timken bearings and races
• Included Components: Carrier bearings/races, pinion bearings/races, and pinion seal
• Installation Hardware: Complete shim kit, pinion nut, and crush sleeve
• Finishing Supplies: Thread locker, marking compound with brush, and silicone sealant

The USA Standard Gear Master Overhaul Kit (ZK F8.8) provides a complete, professional-grade solution for a total differential rebuild. This kit is designed specifically for the Ford 8.8-inch rear end, found in a wide variety of Ford, Lincoln, Mercury, and Mazda vehicles spanning from 1975 to 2014.

Rather than sourcing individual components, this master kit includes every piece required for a high-quality installation, ensuring all wear surfaces and hardware are replaced simultaneously for maximum longevity. The kit features premium Koyo bearings and races, known for meeting or exceeding original equipment specifications for quiet operation and durability under load.

• Fitment: Fits select 1975-2014 Ford, Lincoln, Mercury, and Mazda models with Ford 8.8" differential.
• Manufacturer Part Number: ZK F8.8
• Bearings: High-quality Koyo bearings and races included.
• Included Components: Carrier bearings and races, pinion bearings and races, pinion seal, complete shim kit, ring gear bolts, pinion nut, crush sleeve, thread locker, marking compound with brush, and gasket.