Setting up a differential correctly is the difference between a smooth, quiet drivetrain and one that whines, wears unevenly, or fails prematurely. Carrier shims are the unsung heroes of this process, letting you dial in bearing preload and ring-and-pinion backlash with precision.
Whether you’re rebuilding a truck axle, upgrading an RC car, or restoring a classic Jeep, this guide reviews the best differential shims on the market. You’ll learn what to look for and which kit suits your specific application.
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Camotokiit Super Carrier Shim Kit, 23 Pcs for Ford 8.8", GM 8.0"
Best forClassic GM and Ford axles
- Comprehensive 23-piece assortment
- Easy stacking design
ConsiderLimited to Ford and GM
Motive Gear SS12 Super Carrier Shim Kit for Dana 44, Ford 8.8, GM 8.5, GM 8…
Best forProfessional rebuilds and gear swaps
- Stackable design saves time
- Broad vehicle compatibility
ConsiderPremium price point
Motive Gear SS10 Super Carrier Shim Kit for GM, Ford 7.5, Chrysler 8.0, and…
Best forCompact GM, Ford, Chrysler axles
- Fits many small axles
- Precise dimensions
ConsiderNot for large trucks
SG Store 8PCS RC Differential Shim Compatible with Armma 6s BLX Outer Diame…
Best forArrma 6s BLX RC cars
- Exact fit for Arrma models
- Steel construction
ConsiderOnly 8 pieces per pack
Gearbox Adjustment Shim& Differential Shim&Bearing Steel Pins for Arrma 6S
Best forArrma 6S differential overhaul
- Complete rebuild kit
- Hardened steel upgrade parts
ConsiderLimited to Arrma 6S
Briny River 20Pcs RC Car Differential Shim OD 16mm ID 13mm Thickness 0.15mm…
Best forFine-tuning RC gear mesh
- Ultra-thin for precise adjustments
- Stainless steel rust-resistant
ConsiderOnly one thickness
Rear Differential Shim Kit for 76–86 Jeep CJ5 CJ7 CJ8 | 3141319K 16533.07
Best forJeep CJ AMC 20 axles
- Exact fit for CJ models
- Steel durable construction
ConsiderOnly for AMC 20
Omix-Ada | 16519.09 | Differential Shim Kit | Fits 2007-2018 Jeep Wrangler …
Best forJeep JK Dana axles
- Direct fit no modification
- Lightweight compact package
ConsiderLimited to JK models
Richmond Gear Differential Carrier Shim Kit for Ford 8.8", GM 8.5", Dana 44…
Best forMulti-vehicle differential setups
- Wide compatibility
- OE-quality construction
ConsiderMay duplicate existing shims
Differential Carrier Shim Kit Designed to Fit Ford F250 F350 10.25" or 10.5…
Best forFord Super Duty rear axles
- Specifically for 10.25/10.5
- Includes super shims
ConsiderOnly for Ford trucks
Camotokiit Super Carrier Shim Kit – 23-Piece Value Set
Brand: Camotokiit
A solid, budget-friendly kit for classic Ford and GM differential setups.
This 23-piece kit from Camotokiit covers Ford 8.8 and GM 8.0 applications, making it a versatile addition to your toolbox. The steel shims are easy to use compared to individual shims, saving you time during setup. You can quickly stack them to achieve the exact carrier position you need.
Compatibility spans classic Chevrolets like the Monte Carlo (1970-1972) and K10 (1975-1986), plus G10 vans. If you’re working on older GM or Ford vehicles, this kit offers a practical, all-in-one solution. The manufacturer part number SK SS12 ensures you’re getting a product designed for these specific axles.
- Comprehensive 23-piece assortment
- Easy stacking design
- Covers multiple classic models
- Limited to Ford and GM
- No case included
Motive Gear SS12 Super Carrier Shim Kit – Multi-Platform Precision
Brand: Motive Gear
A top-tier choice for serious differential work across multiple axle types.
Motive Gear’s SS12 kit is a professional-grade solution for Dana 44, Ford 8.8, and GM 8.5/8.6 axles, including Corvette applications. The stackable super shim design allows you to adjust carrier bearing preload and backlash without repeatedly removing the bearings. This feature alone can cut your setup time significantly, especially during complex rebuilds.
It fits a wide range of platforms, from Dana 44 HD to Ford 8.8 IFS and GM 8.875 truck axles. Whether you’re overhauling a differential or installing a locker, this kit simplifies gear mesh positioning. It’s a favorite among professionals for its accuracy and ease of use.
- Stackable design saves time
- Broad vehicle compatibility
- Reduces setup complexity
- Premium price point
- May include unused shims
Motive Gear SS10 Super Carrier Shim Kit – Compact Axle Specialist
Brand: Motive Gear
A dependable shim kit for smaller axle rebuilds and ratio swaps.
This SS10 kit targets smaller axles like GM 7.5, Ford 7.5, and Chrysler 8.0, making it perfect for light trucks and cars. The 2.80-inch outer diameter and 1.75-inch inner diameter shims are precision-machined for accurate setup. You’ll find it invaluable for adjusting carrier bearing preload and ring gear backlash during rebuilds.
Compatibility extends to GM 7.6 IFS, 7.6 IRS, and 7.75 IRS, as well as Chrysler 8.0 applications. If you’re changing gears or rebuilding a differential on a compact axle, this kit provides the shims you need. It’s a reliable choice for achieving proper gear mesh and long-term durability.
- Fits many small axles
- Precise dimensions
- Ideal for gear changes
- Not for large trucks
- Limited to specific sizes
SG Store RC Differential Shim – 8-Piece Precision Spacer
Brand: SG Store
A must-have for Arrma owners seeking drivetrain stability and longevity.
For RC enthusiasts, this 8-piece shim set from SG Store is designed for Armma 6s BLX models like Kraton, Talion, and Notorious. With an outer diameter of 16mm, inner diameter of 13mm, and 0.2mm thickness, these shims offer an exact fit. They help reduce differential gear wobble, which is crucial for high-speed performance.
Made from steel, these shims resist wear and provide long-lasting resilience. By stabilizing the differential assembly, they promote even gear wear and extend the lifespan of your RC car’s drivetrain. If you’re racing or bashing, this simple upgrade can make a noticeable difference in smoothness.
- Exact fit for Arrma models
- Steel construction
- Reduces gear wobble
- Only 8 pieces per pack
- Specific to 6s BLX
GamlyRC Gearbox Adjustment Shim Kit – Complete Arrma 6S Rebuild
This comprehensive kit from GamlyRC is tailored for Arrma 6S 1/8 Kraton v6, Notorious v6, and 1/7 Big Rock or Mojave EXB models. It includes shims, bearing steel pins, and other necessary components to restore your differential to factory-fresh performance. The hardened steel gears and outdrives outlast stock parts, making it ideal for high-power brushless setups.
Precision-engineered for direct compatibility, no modifications are required for installation. If you’re rebuilding a worn differential or upgrading for durability, this kit simplifies the process. It’s a complete solution that saves you from sourcing parts individually.
- Complete rebuild kit
- Hardened steel upgrade parts
- Direct fit no mods
- Limited to Arrma 6S
- Higher cost than basic shims
Briny River RC Differential Shim – Ultra-Thin Stainless Steel
Brand: Briny River
Great for RC hobbyists who need precise shimming to eliminate play.
Briny River offers a 20-piece set of stainless steel shims with a 0.15mm thickness, perfect for fine-tuning gear mesh in most RC differentials. The 16mm outer and 13mm inner diameters ensure a precise fit, and the ultra-thin design lets you make subtle adjustments to reduce play. This is key for achieving smooth, efficient drivetrain operation.
Stainless steel construction provides durability and rust resistance, ensuring long-lasting performance. Whether you’re racing or just maintaining your RC car, these shims help maintain proper spacing and reduce wear. They’re a simple, effective upgrade for any enthusiast.
- Ultra-thin for precise adjustments
- Stainless steel rust-resistant
- 20 pieces good value
- Only one thickness
- Not for large axles
PORC Off Road Rear Differential Shim Kit – Classic Jeep CJ
Brand: PORC Off Road Products
A reliable shim kit for classic Jeep CJ axle rebuilds.
This kit from PORC Off Road Products is designed specifically for 1976-1986 Jeep CJ5, CJ7, and CJ8 models with the AMC 20 rear axle. It includes shims for proper differential spacing and alignment, essential during axle service or rebuild. The steel construction ensures durability and consistent performance.
If you’re restoring a classic Jeep or replacing bearings, this kit provides the shims you need to set carrier position correctly. It’s a niche product but invaluable for CJ owners who want to maintain drivetrain health. Simple and effective, it takes the guesswork out of shimming.
- Exact fit for CJ models
- Steel durable construction
- Includes all needed shims
- Only for AMC 20
- No instructions included
Omix-Ada Differential Shim Kit – Direct Fit for Jeep JK
Brand: Omix-Ada
A straightforward, quality shim kit for Jeep JK differential service.
Omix-Ada’s shim kit is designed for 2007-2018 Jeep Wrangler JK/JKU with Dana 30 or Dana 44 axles. It offers a direct fit, ensuring you don’t have to modify anything during installation. The package is compact, weighing just 0.023 kilograms, and made in the USA for quality assurance.
This kit is perfect for JK owners who are rebuilding their differential or adjusting carrier preload. It provides the necessary shims to achieve proper gear mesh and bearing support. If you want a hassle-free solution for your Wrangler, this is a solid pick.
- Direct fit no modification
- Lightweight compact package
- Made in USA
- Limited to JK models
- No extra shims for other axles
Richmond Gear Differential Carrier Shim Kit – Multi-Axle Alternative
Brand: Richmond
A versatile, high-quality shim kit that covers many popular axles.
Richmond Gear’s carrier shim kit is designed for Ford 8.8, GM 8.5, Dana 44, and Corvette differentials, among others. It replaces Motive Gear 1101 and SS12 kits, offering a compatible alternative. The precision shims help set proper carrier depth during rebuilds and gear installations, ensuring correct gear mesh and reduced noise.
Compatibility spans 1963-1979 Corvette, Dana 44 HD/ICA, Ford 8.8 IFS, GM 8.0, 8.5, 8.6 IRS, 8.625, and 8.875 car/truck axles. Built to OE-quality specifications, this kit provides accurate carrier depth settings. It’s a versatile choice for anyone working on multiple vehicle platforms.
- Wide compatibility
- OE-quality construction
- Reduces gear noise
- May duplicate existing shims
- No case for storage
Elite Gear & Axle Carrier Shim Kit – Ford Super Duty
Brand: Elite Gear & Axle
An essential shim kit for Ford F250/F350 rear axle rebuilds.
This shim kit from Elite Gear & Axle is specifically for Ford F250 and F350 trucks with 10.25 or 10.5-inch rear ends (12-bolt cover), covering model years 1983-2024. It includes a selection of super shims to set backlash and carrier bearing preload, making it essential for heavy-duty axle work.
If you’re rebuilding a Super Duty rear end or changing gears, this kit provides the precision shims you need. The super shim design simplifies adjustments, saving time and effort. It’s a must-have for anyone maintaining these robust axles.
- Specifically for 10.25/10.5
- Includes super shims
- Covers long model range
- Only for Ford trucks
- Heavy-duty focus
Buyer’s Guide: What to Consider
Choosing the right differential shims involves understanding your axle type, the materials, and the precision you need. This guide covers key factors to help you make an informed decision for your vehicle or RC car.
- Axle Compatibility: Ensure the shim kit matches your differential's make and model. Kits are often specific to axle types like Ford 8.8, GM 8.5, or Dana 44. Check the product description for a list of compatible vehicles to avoid buying the wrong set.
- Shim Material: Steel and stainless steel are common materials. Steel offers durability, while stainless steel provides rust resistance, which is beneficial in wet or corrosive environments. For RC cars, steel is typically sufficient, but stainless is a bonus.
- Shim Dimensions: Outer and inner diameters, plus thickness, determine fit and adjustability. Thinner shims (like 0.15mm) allow fine-tuning, while thicker ones (0.2mm) provide larger adjustments. Choose based on the precision you need for your setup.
- Kit Contents: Some kits include a specific number of shims, while others offer a full assortment. Consider how many shims you'll need for your rebuild. Multi-piece kits are more versatile, but single-size packs are cheaper if you only need one thickness.
- Intended Use: Are you rebuilding a full-size truck axle or tuning an RC car? Professional kits with stackable designs are better for complex gear setups, while simple shim packs work for basic adjustments. Match the kit to your skill level and project scope.
Conclusion
Selecting the best differential shims depends on your specific application. For full-size vehicles, kits like Motive Gear SS12 or Richmond Gear offer broad compatibility and precision. For classic Jeeps or Ford trucks, specialized kits from PORC or Elite Gear & Axle ensure a perfect fit.
RC enthusiasts should consider SG Store or Briny River for exact sizing and durability. Always verify axle compatibility and shim dimensions before purchasing. With the right shims, you’ll achieve a smooth, reliable drivetrain that lasts.
Erica Steven is the founder and lead writer of WorstBrands, a site dedicated to providing honest and trustworthy reviews about outdoor gear and fashion products.
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