Fits select 2015-2023 Ford F-150 and Mustang models with the 8.8-inch rear differential.

The USA Standard Gear Master Overhaul Kit (ZK F8.8-D) provides a comprehensive solution for a complete differential rebuild. Instead of sourcing individual components, this kit bundles all necessary hardware and consumables into a single package to ensure a successful installation and long-term reliability. Every component is selected to meet or exceed the requirements for high-load applications in both the F-150 chassis and the independent rear suspension (IRS) of the S550/S650 Mustang.

• Complete Rebuild Components: Includes pinion bearings, carrier bearings, pinion seal, crush sleeve, gear marking compound, and brush.
• Precise Fitment: Specifically engineered for the 2015 and up Ford 8.8-inch rear differential variant.
• Efficiency: Simplifies the ordering process by providing everything required for a professional differential service in one box.
• Quality Assurance: High-quality bearings and seals designed to withstand the torque demands of modern Ford engines.
• Part Number: ZK F8.8-D

Fits select 2009-2014 Ford F-150 and Mustang models with the Ford 8.8-inch rear end.

The USA Standard Gear Master Overhaul Kit (ZK F8.8-B) is a comprehensive solution for technicians and enthusiasts performing a complete differential rebuild. This kit eliminates the need to source individual components by providing premium Koyo bearings and all the necessary hardware required to set gear mesh and preload correctly. Whether you are addressing bearing noise or installing a new ring and pinion set, this kit ensures a professional-grade installation with components designed for durability and precise tolerances.

• Premium Koyo carrier bearings and races
• Koyo pinion bearings and races
• High-quality pinion seal and pinion nut
• Complete shim kit for accurate depth and backlash adjustment
• Heavy-duty ring gear bolts and crush sleeve
• Installation essentials: Thread locker, marking compound with brush, and gasket
• Manufacturer Part Number: ZK F8.8-B

Fits select 2011-2019 Ford E-250, E-350 Super Duty, F-150, F-250 Super Duty, and F-350 Super Duty models with 10.5-inch differential housings.

The USA Standard Gear Master Overhaul Kit (ZK F10.5-D) provides a comprehensive solution for a professional differential rebuild. This kit is specifically engineered for Ford 10.5-inch housings utilizing the OEM ring and pinion set. By bundling all necessary high-grade components into a single package, it ensures you have the exact parts required for a precise installation, reducing downtime and sourcing errors.

This kit features premium Koyo bearings and races, trusted for their tight tolerances and durability in high-load truck applications. From the carrier bearings to the marking compound, every component is selected to provide a quiet, reliable gear setup that meets or exceeds factory performance.

• Includes Koyo carrier bearings and races
• Includes Koyo pinion bearings and races
• Pinion seal, pinion nut, and crush sleeve
• Complete shim kit for precise gear pattern adjustment
• Ring gear bolts and high-quality gasket
• Thread locker and marking compound with brush
• Manufacturer Part Number: ZK F10.5-D

Fits select 1999-2007 Ford E-250, E-350, Excursion, F-150, F-250, and F-350 models with the 10.5-inch rear differential.

The USA Standard Gear Master Overhaul Kit (ZK F10.5-A) is a comprehensive solution for a professional-grade differential rebuild. This kit streamlines the repair process by grouping all essential components under a single part number, ensuring component compatibility and reducing downtime. Each kit features premium Koyo bearings and races, recognized for their precision tolerances and durability in high-load truck applications.

• Carrier bearings and races
• Pinion bearings and races
• Pinion seal and crush sleeve
• Complete shim kit for precise adjustment
• Ring gear bolts and pinion nut
• Thread locker and gasket
• Marking compound with application brush
• Manufacturer Part Number: ZK F10.5-A

Designed to restore factory-quiet operation and proper gear alignment, this master overhaul kit provides the high-quality hardware required for a successful ring and pinion installation or high-mileage service.

Fits select 1979-2014 Chevrolet and GMC C2500/K2500, Suburban, Silverado, and Savana models equipped with a 9.5-inch 33-spline open differential.

The USA Standard Gear ZIKGM9.5-S-33 spider gear kit is a direct replacement for worn or damaged internal carrier gears. Designed to restore smooth operation to your GM 14-bolt 9.5" rear end, this kit uses high-grade materials to provide a longer-lasting alternative to standard OE components. It provides everything necessary for a complete refresh of your open carrier, eliminating noise and play associated with chipped or worn gear teeth.

• Fits GM 9.5" open differentials
• Spline Count: 33 Spline
• Precision-manufactured for high-load durability
• Complete internal gear replacement kit
• Manufacturer Part Number: ZIKGM9.5-S-33

Kit Includes:

• (2) Side Gears
• (2) Pinion Gears
• (1) Cross Pin Shaft
• (1) Cross Pin Bolt
• Spider Gear Thrust Washers

Fits select 1997-2012 Chrysler Aspen, Dodge Dakota, Durango, Nitro, Ram 1500, and Jeep Cherokee, Grand Cherokee, and Liberty with the Chrysler 8.25-inch 29-spline rear axle.

This USA Standard Gear open spider gear set provides a direct-fit solution for restoring a worn or damaged open differential. Designed to meet or exceed original equipment specifications, this kit replaces internal components that often suffer from chipped teeth or excessive play, which can lead to drivetrain noise, vibration, and eventual failure. Each component is manufactured using high-strength materials to ensure proper mesh within the carrier and reliable power distribution between the wheels.

• Fits Chrysler 8.25-inch rear axles with 29-spline shafts
• Restores original differential function and eliminates internal play
• Complete refresh kit for open (non-limited slip) differentials
• Manufacturer Part Number: ZIKC8.25-S-29

Kit Includes: Two (2) side gears, two (2) pinion gears, cross pin shaft, cross pin bolt, and spider gear thrust washers.

Fits select 1980-2014 Buick, Cadillac, Chevrolet, and GMC vehicles with GM 8.5" or 8.6" rear differentials.

USA Standard Gear ring and pinion sets are engineered to provide a reliable, high-quality solution for differential repairs and gear ratio changes. Every gear set undergoes a rigorous in-house quality evaluation to ensure it meets strict dimensional, material, and fitment standards. This set is designed to replace worn factory components or adjust your final drive ratio for improved performance in street or off-road applications.

• Ring Gear Diameter: 8.50 inches
• Gear Ratio: 3.73
• Pinion Spline Count: 30
• Ring Gear Bolt Count: 10
• Compatible Differentials: GM 8.5" and 8.6"
• Manufacturer Part Number: ZG GM8.5-373

Fits select 1964-1972 Chevrolet Bel Air, Biscayne, Camaro, Caprice, Chevelle, Chevy II, El Camino, Impala, Monte Carlo, and Nova models equipped with the GM 8.2-inch differential.

USA Standard Gear ring and pinion sets are engineered to provide a reliable solution for replacing worn factory gears or adjusting gear ratios for specific driving needs. Every set undergoes rigorous in-house quality evaluation, ensuring each component meets strict dimensional, material, and fitment standards to ensure a quiet and durable installation.

• Manufacturer Part Number: ZG GM8.2-355
• Ring Gear Diameter: 8.20"
• Gear Ratio: 3.55
• Ring Gear Bolts: 10
• Pinion Splines: 25
• Differential: GM 8.2"

Fits select 1964-1972 Buick, Chevrolet, and Pontiac passenger car models with a GM 12-bolt rear differential.

This USA Standard Ring and Pinion Gear Set is engineered to provide a reliable, high-quality solution for differential rebuilds and gear ratio changes. Designed to meet or exceed original equipment standards, each set undergoes rigorous in-house quality testing to verify dimensional accuracy, material integrity, and proper fitment. This 3.90 ratio set is ideal for drivers looking to optimize torque delivery and acceleration while maintaining the durability required for classic GM passenger car applications.

• Fits GM 12-bolt passenger car differentials
• Ring Gear Diameter: 8.875 inches
• Ring Gear Bolt Count: 12
• Pinion Spline Count: 30
• Gear Ratio: 3.90
• Manufacturer Part Number: ZG GM12P-390

Fits select 1953-2006 Ford, Chevrolet, GMC, Dodge, International, and Jeep vehicles equipped with a standard rotation Dana 44 axle. This 5.38 ratio ring and pinion gear set provides a reliable solution for replacing worn factory components or re-gearing to accommodate larger tires and improved low-end torque.

USA Standard Gear sets undergo rigorous in-house quality evaluations to ensure they meet strict dimensional and material tolerances. These gears are engineered for durability in demanding applications, providing a precise fit and smooth operation when properly shimmed and installed. This set is designed specifically for standard rotation housings and utilizes a 26-spline pinion configuration.

• Axle Model: Dana 44
• Gear Ratio: 5.38
• Rotation: Standard
• Ring Gear Diameter: 8.50"
• Ring Gear Bolts: 10
• Pinion Spline Count: 26
• Manufacturer Part Number: ZG D44-538

Fits 1965-1969 Chevrolet C10 and K10, and 1966-1969 GMC C15/C1500 and K15/K1500 Pickups.

This USA Standard Gear replacement axle shaft is designed to restore dependable drivetrain operation in classic GM trucks equipped with a 12-bolt rear differential. Engineered for a precise fit, this 30-spline shaft serves as a direct replacement for worn or snapped OE components, ensuring your vehicle maintains proper power transfer to the wheels.

• Manufacturer Part Number: ZA G3893605
• Differential Compatibility: GM 12-Bolt Rear
• Spline Count: 30-Spline
• Length: 30-3/4 inches (30.75")
• Engineered for 4WD and 2WD GM Pickup applications

Fits select 1997-2005 Chevrolet S10, Blazer, GMC Sonoma, Jimmy, and Oldsmobile Bravada models.

The USA Standard Gear ZA G26050549 axle shaft is a high-strength replacement for factory rear axles in GM 7.625" differentials. Manufactured from high-quality alloys and subjected to advanced heat-treating processes, this shaft is designed to exceed original equipment standards for durability and torsional strength. Whether you are restoring a daily driver or upgrading a trail-ready 4WD truck, this axle provides the reliability needed for diverse street and off-road conditions.

• Length: 28-13/16 inches
• Spline Count: 28
• Wheel Bolt Pattern: 5 Lug
• Differential Application: GM 7.625"
• Installation: Replaces worn or snapped factory axle shafts
• Manufacturer Part Number: ZA G26050549

Fits select 1989-1996 Buick Roadmaster, Cadillac Brougham and Fleetwood, and Chevrolet Caprice and Impala SS.

This USA Standard replacement axle shaft provides a direct-fit solution for worn or damaged factory components on GM B-body and D-body vehicles. Engineered to meet factory tolerances, this shaft restores reliable power delivery to the wheels. It is precision machined to ensure proper fitment with your existing differential and wheel hub assembly, replacing shafts that have suffered from bearing surface wear or spline damage.

• Manufacturer Part Number: ZA G26018080
• Overall Length: 30 3/8 inches
• Spline Count: 30
• Bolt Pattern: 5 x 5 metric pattern
• Direct replacement for original equipment axle shafts

Fits select 1980-1991 Chevrolet and GMC Blazer, K10, K1500, V10, and V1500 4WD trucks and SUVs.

The USA Standard Axle Shaft (ZA G14039547) is engineered as a dependable replacement for worn, twisted, or broken factory shafts. This high-strength steel shaft is precision-machined to ensure a perfect fit into your vehicle's differential, restoring proper power delivery to the wheels. Designed for the rigors of 4WD use, it provides a cost-effective alternative to OEM parts without compromising on structural integrity or fitment.

• Manufacturer Part Number: ZA G14039547
• Spline Count: 28-Spline
• Length: 31.5 inches
• Construction: High-strength steel for durability
• Application: Direct-fit replacement for select GM 4WD vehicles

Fits select 1965-1979 Chevrolet Camaro, Chevelle, Chevy II, and Nova models with GM 8.2" or 8.5" rear differentials.

This USA Standard Gear replacement axle shaft is designed to restore drivetrain integrity for classic GM passenger cars. Engineered as a direct-fit solution, this shaft replaces worn or damaged factory components to ensure smooth power delivery and reliable operation. Each axle is built to meet high manufacturing standards, providing a dependable alternative to salvaged or fatigued original equipment.

• Differential Fitment: GM 8.2in & 8.5in Passenger Car
• Length: 29 1/2in (29.5")
• Spline Count: 28
• Hub Diameter: 2.780in Brake Pilot
• Manufacturer Part Number: ZA G1255803-SH

Fits select 1968-1981 Chevrolet Camaro, Chevelle, Monte Carlo, and Pontiac Firebird with GM 8.2" and 8.5" 10-bolt rear differentials.

This USA Standard Gear replacement axle shaft is engineered to restore drivetrain reliability in classic GM passenger car applications. Designed as a direct-fit solution, this 28-spline axle is precision-machined to ensure proper engagement with the differential side gears and a secure fit within the housing. It provides a cost-effective alternative to expensive custom axles while maintaining the structural integrity required for street performance and daily driving.

• Manufacturer Part Number: ZA G1255802-SH
• Differential Fitment: GM 8.2" & 8.5" (10-Bolt)
• Axle Length: 30 1/8"
• Spline Count: 28
• Hub Diameter: 2.780"
• Application: Rear Axle Passenger Car