Differential

What Is a Differential and Why Does It Matter?

The differential is one of the most fundamental components in your vehicle's driveline. Sitting at the heart of your axle assembly, it allows the left and right wheels on the same axle to rotate at different speeds — a critical function when cornering, since the outside wheel must travel a greater distance than the inside wheel. Without a properly functioning differential, tires would scrub, understeer would worsen, and drivetrain stress would skyrocket.

But the differential is far more than just a cornering aid. The type of differential you run has a profound effect on traction, handling, and capability — whether you're daily driving on pavement, towing a heavy trailer, racing on a track, or crawling over boulders on the trail.

Types of Differentials: Open, Limited-Slip, and Locking

Understanding the differences between differential types helps you choose the right unit for your driving needs:

• Open Differentials are the factory standard on most vehicles. They efficiently distribute torque between wheels but will send power to the wheel with the least resistance — meaning a spinning wheel in mud or on ice gets all the power while the wheel with grip gets none.
• Limited-Slip Differentials (LSD) use clutch packs, helical gears, or other torque-biasing mechanisms to continuously redirect power to the wheel with better traction, without full lock-up. They're ideal for performance driving, towing, and mild off-road use.
• Locking Differentials force both wheels on an axle to rotate together at the same speed, delivering 100% of available torque to both wheels simultaneously. Automatic lockers engage without driver input, while selectable lockers let the driver activate locking on demand — making them a top choice for serious off-road and rock crawling use.

Key Considerations When Shopping for a Differential

Before selecting a differential, consider your axle type and housing (Dana, GM, Ford, Chrysler, etc.), your spline count, your intended use, and whether you want a full replacement carrier or a drop-in unit. Rebuilding an existing differential with a new carrier, spider gears, or a locker is common for upgrades, while worn or damaged housings may require a full assembly replacement.

Top Differential Brands

Eaton Torque Control Products is the dominant name in performance and OEM-grade differentials. With over 100 years in the vehicle business, Eaton's lineup spans automatic limited-slip, automatic locking, and electronic selectable locking differentials — all highly engineered and validated for applications from daily driving to racing, towing, and rock crawling. Iconic Eaton products include the Detroit Locker, Detroit Truetrac, ELocker, MLocker, and the Progressive Torque Differential (PTD).

Yukon Gear & Axle is a go-to brand for enthusiasts and professionals who demand precision-fit drivetrain components. Yukon tests thousands of parts monthly in-house, measuring to .0002" tolerances for unmatched fit and performance. Their differential lineup includes the Dura Grip limited-slip carrier, the Grizzly Locker, and a vast catalog of carriers, rebuild kits, and spider gear sets spanning virtually every popular axle platform — from GM and Ford to Chrysler and Dana.

Crown Automotive is the premier source for OEM-quality differential replacement parts for Jeep vehicles. Since 1963, Crown has built its reputation on offering the largest line of Jeep replacement parts — including differential gear sets, bearing cones, and axle components — covering every model from the CJ series through current Wrangler and Gladiator platforms.

Lube Locker rounds out the category with its specialty reusable differential cover gaskets, providing a reliable, reusable seal for differential covers across a wide range of axle housings — a small but critical part of any differential service or rebuild job.