Best Differential Assembly Kits of 2026

Robert Reyes Avatar
Robert Reyes
Last Updated: Jan 10, 2026

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Differential Assembly Kits are essential for anyone who wants to upgrade or repair their vehicle's differential. These kits come with all the necessary parts and components for a hassle-free installation or repair. They include bearings, seals, shims, and gaskets, among others, ensuring that the differential assembly works optimally. Differential Assembly Kits are available for various types of differentials, including open, limited slip, and locking differentials, making them suitable for a wide range of vehicles. With these kits, vehicle owners can improve their vehicle's performance, durability, and longevity, ensuring smooth and safe journeys.

At a Glance: Our Top Picks

Yukon friction modifier/posi additive Cover #TOP 1
Yukon friction modifier/posi additive
ftb score rating icon 9.8
Motoforti 4WD Front Differential Actuator for Chevy and Cadillac Cover #TOP 2
Motoforti 4WD Front Differential Actuator for Chevy and Cadillac
ftb score rating icon 9.7
Flynsu PSL400 Axle Disconnect Kit for Dodge Ram 1500-3500 4WD Cover #TOP 3
Flynsu PSL400 Axle Disconnect Kit for Dodge Ram 1500-3500 4WD
ftb score rating icon 9.5

Top 10 Differential Assembly Kits

#TOP 1

Yukon friction modifier/posi additive

OILADD
No Color
No Size
Yukon friction modifier/posi additive Cover
Friction Modifier Positraction Additive for Limited Slip Differentials

The Yukon posi additive is a must-have for any vehicle equipped with a clutch-style limited slip differential. This additive is specifically designed to enhance the performance of positraction systems, ensuring smoother and more reliable operation. It is compatible with both mineral and synthetic oils, making it suitable for a wide range of applications. By using the Yukon posi additive, you can improve the traction and handling of your vehicle, especially during challenging driving conditions. Say goodbye to wheel slippage and hello to enhanced grip and stability. With the Yukon posi additive, you can enjoy a smoother and more controlled driving experience.

What We Like
Enhances positraction performance
Compatible with mineral and synthetic oils
Improves traction and handling
#TOP 2

Motoforti 4WD Front Differential Actuator for Chevy and Cadillac

Black, Gray
6.69''x2.01''
Motoforti 4WD Front Differential Actuator for Chevy and Cadillac Cover
Motoforti 4WD Front Four Wheel Drive Actuator, 4x4 Front Differential Axle Actuator, for Chevy Silverado Avalanche K1500 K2500 K3500, ABS, 26060073, 600-101, Black

The Motoforti 4WD Actuator is designed to fit a wide range of Chevy and Cadillac models, making it a great choice if you need a reliable replacement part. This actuator automatically locks the hubs when you switch to four-wheel drive, ensuring your vehicle drives smoothly in tough conditions. Made from durable ABS material, it resists wear and scratches, so it lasts longer. Installation is simple and doesn’t require special tools, allowing you to quickly replace your front axle differential shift actuator without hassle. Overall, this product helps you easily switch between two-wheel and four-wheel drive for better control and performance.

What We Like
Wide vehicle compatibility
Automatic hub locking
Durable ABS construction
Easy, tool-free installation
#TOP 3

Flynsu PSL400 Axle Disconnect Kit for Dodge Ram 1500-3500 4WD

Flynsu PSL400 450400
Flynsu PSL400 Axle Disconnect Kit for Dodge Ram 1500-3500 4WD Cover
Flynsu PSL400 Axle Disconnect Kit Replacement for 1994-2002 Dodge Ram 1500 2500 3500 4WD Differential Cable Lock Kit

The Flynsu Ram Axle Disconnect is designed specifically for Dodge Ram 1500, 2500, and 3500 models from the mid-1990s to early 2000s. This kit allows you to easily convert your axle shaft disconnect system, providing better control over your vehicle's 4WD differential. It's a perfect replacement cable lock kit that fits various engine sizes, ensuring compatibility with your truck. With this product, you get a reliable and straightforward way to maintain or upgrade your axle disconnect system, helping improve your vehicle’s performance and drivetrain efficiency. Plus, it comes with a 12-month warranty for added peace of mind.

What We Like
Wide Dodge Ram compatibility
Axle shaft disconnect conversion
Reliable cable lock replacement
Supports multiple engine sizes
12-month warranty included
#TOP 4

ARB 170112 Differential Breather Kit

ARB
170112
Factory
ARB 170112 Differential Breather Kit Cover
ARB 170112 Differential Breather KIT Vent The air Pressure in drivetrain Assemblies Such as The differentials, Transmission and Transfer case.

The ARB Differential Breather Kit is a high-flow system that eliminates water from contaminating the oil and damaging your vehicle's drivetrain components. It includes a central high-flow air filter and manifold that can vent up to four drivetrain assemblies to avoid water during crossings. Without this kit, the air inside the assemblies can expand and increase pressure, causing damage to your vehicle.

What We Like
Eliminates water from contaminating the oil and damaging your drivetrain components
High-flow system with no back pressure and zero vacuum breather
Includes central high-flow air filter and manifold that can vent up to four drivetrain assemblies
#TOP 5

MOJIOO 600-101 4WD Actuator for Chevy GMC Cadillac

600-101
MOJIOO 600-101 4WD Actuator for Chevy GMC Cadillac Cover
600-101 4WD Actuator Compatible with Chevy Silverado Avalanche K1500/2500/3500 GMC Canyon Yukon Cadillac Escalade,4x4 Front Differential Axle Actuator Replace# 26060073 8260600730

The MOJIOO 4WD Actuator is designed to keep your vehicle's four-wheel drive system working smoothly by automatically managing power between your front wheels. This means you can switch effortlessly between 2WD and 4WD, improving your driving experience on different terrains. It replaces specific part numbers like 26060073 and 8260600730, making it easy to find the right fit for your Chevy, GMC, or Cadillac. Built with durable materials, this actuator resists corrosion and sticking, so it lasts longer than the original part. With this reliable replacement, you’ll restore your vehicle’s traction and enjoy safer, more confident driving in snow, rain, or off-road conditions.

What We Like
Automatic 2WD/4WD control
Wide vehicle compatibility
Durable, corrosion-resistant build
Longer lifespan than original
Improves traction and safety
#TOP 6

NewYall Front Differential Lock Actuator for Dodge Ram 1500

52ll4387AE
NewYall Front Differential Lock Actuator for Dodge Ram 1500 Cover
NewYall Front Differential 4WD Lock Axle Actuator for Dodge Ram 1500 Pickup 2006-2010, Ram 1500 2011-2016

The NewYall 4WD Lock Actuator is designed specifically for Dodge Ram 1500 models from 2006 to 2016. If you own a Ram 1500 within these years, this part fits perfectly, making it easy for you to upgrade or replace your front differential. It supports front differentials sized 205mm or 215mm, ensuring compatibility with your vehicle's setup. This actuator helps lock the front axle, which can improve your truck's traction in tough driving conditions, giving you better control and confidence on rough or slippery roads.

What We Like
Compatible with Dodge Ram 1500
Fits 2006-2016 models
Supports 205mm and 215mm differentials
Enhances front axle locking
#TOP 7

Dorman 81048 Differential Shaft Lock Bolt

81048
Pack of 1
Dorman 81048 Differential Shaft Lock Bolt Cover
Dorman 81048 Differential Shaft Lock Bolt Compatible with Select Models

The Dorman Lock Bolt is a direct replacement part designed to fit and function just like your vehicle's original differential pinion shaft lock bolt. This means you can trust it to restore your differential’s integrity without any hassle. It’s a great choice if your original bolt is lost or worn out from use, helping you avoid costly repairs. Made from durable materials, this bolt offers long-lasting performance, so you don’t have to worry about frequent replacements. Plus, it’s backed by a knowledgeable US-based team with over a century of automotive experience, giving you confidence in its quality and reliability.

What We Like
Direct replacement fit
Reliable fatigue replacement
Durable material construction
Expert-backed quality
#TOP 8

Motive Gear (SS12) Differential Carrier Shim

SS12
Stock
Motive Gear (SS12) Differential Carrier Shim Cover
Motive Gear Differential Shim, Steel, Natural, GM 12-Bolt, Kit

The Motive Gear Differential Carrier Shim is a high-quality product designed to improve the performance of your vehicle's differential assembly. With dimensions of 10.69 L x 6.46 H x 9.34 W (inches), this shim is easy to install and provides a perfect fit for your differential. Weighing 13.15 pounds, it is sturdy and durable, ensuring long-lasting performance. Made in China, this differential carrier shim from Motive Gear is known for its reliability and precision. The part number SS12 makes it easy to identify and locate. Upgrade your vehicle's differential assembly with the Motive Gear Differential Carrier Shim for enhanced performance and smoother rides.

What We Like
Perfect fit
Durable construction
Reliable and precise
#TOP 9

Z Automotive Z Locker OEM for Jeep Wrangler & Gladiator

Z_LKR_OEM
Z Automotive Z Locker OEM for Jeep Wrangler & Gladiator Cover
Z Automotive Z Locker OEM fits 2020-2024 Wrangler JL Gladiator JT Rubicon | Fully Functioning Lockers with No Side Effects, Easy Installation | Z_LKR_OEM

The Z Automotive Z Locker is designed to fit Jeep Wrangler and Gladiator models from 2018 to 2026, making it a versatile upgrade for your vehicle. It offers a quick solution by allowing you to install fully functional lockers without the need to replace the entire axle assembly, saving you both time and money. Installation is straightforward—you simply unplug the existing locker and plug the Z Locker in between the axle and harness, making the process hassle-free. Additionally, it bypasses faulty sensors, so your locker works smoothly without triggering error messages, ensuring your vehicle’s computer system stays happy and functional.

What We Like
Wide vehicle compatibility
Cost-effective axle upgrade
Simple plug-and-play installation
Faulty sensor bypass
#TOP 10

Dorman Differential Lock Sensor Connector for Jeep

600-250
Dorman Differential Lock Sensor Connector for Jeep Cover
Dorman 600-250 Differential Lock Sensor Connector Compatible with Select Jeep Models

The Dorman 600-250 Differential Lock Sensor Connector is a reliable replacement for your factory hardware on specified applications. This connector is a direct replacement and matches the appearance and function of the original part. It is made from quality materials to ensure durable construction and long service life. To ensure fit, input your make, model, and trim level into the garage tool. Dorman is a trustworthy brand backed by a team of product experts in the United States with over a century of automotive experience.

What We Like
Direct replacement for factory hardware
Durable construction for reliable performance and long service life
Trustworthy brand backed by product experts with over a century of automotive experience
Buying Guide Image

Frequently Asked Questions (FAQs)

1. Can you rebuild a rear differential?

Yes, it is possible to rebuild a rear differential. This process involves replacing the housing, gears, bearings, and seals. It is recommended to have a certified mechanic perform the rebuild, as it can be a complex task that takes three to five hours on average.

2. How much does it cost to replace differential bearings?

The cost of replacing differential bearings typically ranges from $200 to $400. This cost includes the replacement of bearings, seals, and fluid changes. However, if a gear change is required, the cost can increase significantly, with a minimum of $1,500 for new gears.

3. How much is a differential for a truck?

The price of a differential for a truck can vary depending on the specific requirements. If new gears are needed, the cost can start at $1,500. In the worst-case scenario where the differential is beyond repair, a complete replacement can cost up to $4,000.

4. How much does a diff rebuild cost?

The cost of a differential rebuild or replacement can range from $400 to $600 for repair and $1,500 to $3,000 for a rear differential replacement. The final cost depends on factors such as the make and model of the vehicle and the type of differential.

5. Is it worth fixing a rear differential?

In general, the rear differential is designed to last the life of the car and does not require replacement or repair unless it fails. Therefore, it is not necessary to fix a rear differential unless it is experiencing issues or failure.

6. How do I know if my rear differential bearings are bad?

Signs of bad rear differential bearings include clunking noises, howling noises when gears are not properly supported, and rumbling while turning. These indicators suggest that the bearings are worn out and may need to be replaced.

7. What are the signs of a bad rear differential?

Signs of a bad rear differential include whining or whirring noises, overheating, vibrations, handling or steering problems, gear grinding, tyre damage, oil leaks, and an out-of-balance driveshaft.

8. Is it OK to drive with a bad differential?

While it is possible to drive with a damaged differential, it is not the safest option. Driving with a bad differential can cause damage to other parts of the car and make the repair more expensive. It is recommended to have the differential repaired as soon as possible.

9. Can I replace a differential myself?

Replacing a differential is a complex task and generally not recommended as a DIY project. It requires heavy lifting and proper expertise. It is advisable to take the vehicle to an auto repair shop to ensure the job is done correctly.

Editor's Notes

During our differential assembly kit research, we found 24 differential assembly kit products and shortlisted 10 quality products. We collected and analyzed 16,322 customer reviews through our big data system to write the differential assembly kits list. We found that most customers choose differential assembly kits with an average price of $21.26.

The differential assembly kits are available for purchase. We have researched hundreds of brands and picked the top brands of differential assembly kits, including Yukon Gear & Axle, Motoforti, Flynsu, ARB, MOJIOO. The seller of top 1 product has received honest feedback from 177 consumers with an average rating of 4.9.

Written by
Robert Reyes Avatar

Robert Reyes is a dedicated writer from San Francisco with a bachelor of degree in mechanics and a bachelor of degree in marketing. He focuses on making some complicated topics simple and enjoys explaining complex and technical things in an easy-to-understand way.