Motive Gear SS12 Super Carrier Shim Kit for Dana 44 & GM/Ford Axles — Stackable shims for precise carrier preload and backlash

The Motive Gear SS12 Super Carrier Shim Kit is a stackable set of precision shims designed to speed and simplify carrier bearing preload and ring gear backlash setup for Dana 44, Ford 8.8, GM 8.5/8.6/8.875 and Corvette differentials.

If you rebuild axles, install new gear sets, or upgrade lockers, dialing in carrier position is critical for durable, quiet gear mesh. The SS12 uses a modular shim stack so you can change carrier position in fine increments without continually pressing bearings on and off the carrier. That reduces bench time and helps you reach correct preload and backlash quickly during installation or service.

How does the SS12 make differential setup faster and more accurate?

The Super Shim system replaces repetitive bearing presses with thin, stackable spacers that adjust carrier clearance in predictable steps. Technicians can add or remove individual shims until the desired preload and backlash are achieved, avoiding trial-by-pressing. This controlled approach lowers the risk of damage and shortens total installation time.

• Stackable shim pieces for incremental adjustments
• Eliminates repeated bearing removal during trials
• Reduces setup time for gear swaps and rebuilds
• Helps reach consistent carrier bearing preload values

Which axle and vehicle applications does this kit support?

The SS12 is engineered for a broad range of common domestic axles, covering Dana 44 variants, Ford 8.8 (including IFS), multiple GM sizes (8.0, 8.5, 8.6, 8.875) and classic Corvette differentials. It’s suitable for both passenger car and light-truck applications where those carrier dimensions are used. Check compatibility against your axle housing and carrier specifications before ordering.

• Fits Dana 44 HD and Dana 44 ICA platforms
• Compatible with Ford 8.8 and Ford 8.8 IFS assemblies
• Works with GM 8.0 / 8.5 / 8.6 / 8.875 passenger and truck axles
• Supports 1963–1979 Corvette differential setups

Will the SS12 help with performance or locker installations?

Yes — when installing a locker, different ring-and-pinion ratio, or high-performance gear set, precise carrier positioning is essential for longevity and noise control. The SS12 lets you fine-tune the carrier so the new gear mesh sits within manufacturer-recommended backlash and preload ranges. That accuracy reduces the chance of premature wear or noisy operation after upgrades.

• Facilitates correct ring-and-pinion mesh after ratio changes
• Assists locker and limited-slip installations for proper fitment
• Useful for both OEM replacements and performance builds

What are the durability and warranty details for Motive Gear SS12?

Motive Gear manufactures the SS12 to meet drivetrain service demands with robust materials and consistent tolerances. The kit is backed by Motive Gear’s limited warranty coverage, giving you a safeguarded purchase for standard service conditions. Keep installation records and receipts to support any warranty claim.

• Precision-manufactured shims with consistent thickness control
• Designed for repeated use during rebuilds and bench setups
• Covered by Motive Gear warranty terms (1-Year / 50,000-Mile where applicable)

Who is this for: The SS12 Super Carrier Shim Kit is aimed at professional mechanics, drivetrain specialists, and experienced DIYers who perform differential rebuilds, gear swaps, or locker installations on domestic axles. If you need repeatable, fine adjustments to carrier position without the hassle of constant bearing presses, this kit streamlines setup while helping you achieve reliable gear engagement for passenger cars, trucks, and classic Corvette applications.

Part specifics: Item No. SS12, outside diameter 3.00" (76.2 mm), inside diameter 2.25" (57.15 mm). Replaces several OEM and aftermarket shim references and is compatible with a wide list of Buick, Cadillac, Chevrolet, and other GM model years where the listed axle sizes are used.