Powertrax Lock-Right

 Powertrax Lock Right Locker - Automatic Locking Differential

The POWERTRAX LOCK-RIGHT Locker is the original locking differential that could be easily installed in existing case assemblies without any special tools or setup equipment.

 The LOCK-RIGHT’s operation is fully automatic. Designed to send the engine power to the wheels with the most traction, the LOCK-RIGHT will help get you where you want to go. While traveling straight, the LOCK-RIGHT will lock the axles together similar to a spool. However, when the wheels need to differentiate in a turn, the LOCK-RIGHT will allow the outside wheel to rotate faster to complete the turn. The internal gears on the LOCK-RIGHT will overrun each other to allow this differentiation.


The Powertrax Lock-Right Locker works well on the front axle of 4-wheel drive vehicles provided a couple of important guidelines are followed. The Lock-Right Locker should be used only on vehicles equipped with locking hubs on the front axle or with front axle disconnect. In addition, the vehicle must not be equipped with full time 4-wheel drive. Vehicles equipped with a Lock-Right Locker on the front axle should not be operated on the highway with the front hubs locked and 4-wheel drive engaged. Following these guidelines will ensure very acceptable on-road driveability while still providing maximum off-road traction.

Call the Powertrax Lock-Right experts at West Coast Differentials today for pricing, application information and expert technical advice!

Order / Tech: (800) 510-0950

Not sure which Locking Differential or Posi is the right one for you? No problem! Our Differential Professionals are here to help Monday thru Friday, 8am to 5pm Pacific Standard Time.

Powertrax Lock-Right Application Chart:




Detroit Truetrac Limited Slip Differentials

 Detroit Truetrac TrueTrack Trutrac TruTrack or True Track

Eaton’s Detroit Truetrac was the first helical gear differential ever introduced into the automotive aftermarket.

The Detroit Truetrac remains the leading gear-type limited slip differential in the industry.

Detroit Truetrac’s proven design eliminates the need for wearable parts, resulting in maintenance free traction. Recognized not only for its durability but also it’s smooth and quiet operation. Engineered to work efficiently in front and rear axles, semi-floating (C-clip axles) and transfer cases. Power transfer is so smooth, it literally goes unnoticed by the driver – even in front wheel drive axles.

Proven design and effective performance, all make the Detroit Truetrac limited slip differential the ideal choice for a wide variety of vehicle applications.

No maintenance – Just Traction!

Call the Detroit Truetrac experts at West Coast Differentials today for pricing, application information and expert technical advice at:


We stock the entire line of Eaton Performance Differentials, including the Detroit Locker®, Eaton ELocker®, Detroit Truetrac® and Eaton Posi™. To see the entire lineup including technical information, application information and service kits, go to the Eaton Performance Application Guide

Check out the Eaton Detroit Truetrac FAQ’s page

Not sure which Locking Differential or Posi is the right one for you? No problem! Our Differential Professionals are here to help Monday thru Friday, 8am to 5pm Pacific Standard Time.


Eaton ELocker

 Eaton ELocker, E-Locker or E Locker

The ELocker’s electromagnetic locking mechanism is the next generation of aftermarket differential technology.

Performs as an open differential until you decide that you need more traction. Eaton ELocker is your push button solution to almost any traction problem.

Designed expressly for 4-wheel drive systems to give you the ability to lock or unlock the differentials when necessary. When locked the Eaton ELocker performs as a full locker, capturing 100% of available torque and sending it equally to both ends of the axle.

The ELocker is built with precision-forged gears that are designed to mesh perfectly, providing improved strength and durability over a standard cut gear. Its ease of installation, reliability and push-button activation make ELocker an absolute must for all traction and off-road performance applications


  • Virtually maintenance free
  • Push button traction
  • Positive-Electronic lock


Check out the Eaton ELocker FAQ’s page

Watch a video about the Eaton ELocker

Call the Detroit Locker experts at West Coast Differentials today for pricing, application information and expert technical advice at: (800)375-6849

Not sure which Locking Differential or Posi is the right one for you? No problem! Our Differential Professionals are here to help Monday thru Friday, 8am to 5pm Pacific Standard Time.



ARB Air Lockers

ARB Air Locker - Selectable locking differentials

ARB Air Locker – Air Operated Locking Differentials for 100% Traction!

ARB Air Lockers were created to provide 100% traction on demand, without sacrificing any of your vehicle’s highway driving performance, these locking differentials employ a 12 volt air compressor designed to activate (and deactivate) a solid and durable locking mechanism inside the differential. This gives you the traction you need, when you need it, all at the flick of a switch, all within the safety and comfort of the driver’s seat.

When activated, the Air Locker prevents the differential gears from rotating and therefore prevents the axle shafts from turning independently of each other. With both wheels tied directly to the rotation of the ring gear, the vehicle maintains maximum possible traction at all times. When unlocked, it operates just like conventional “open” differentials.

The experts at West Coast Differentials are well qualified and have many years of experience dealing with ARB Air Lockers. We can help you decide if an Air Locker is right for your application and make sure you get the correct unit for your vehicle. Our large inventory means most applications are IN-STOCK and READY TO SHIP same day!

We also stock ARB Air Locker replacement parts, installation components and ARB Air Compressors.

See our ARB Air Compressors & Accessories page for more information about ARB Air Compressors and Accessories .

 ARB Air Locker Application Chart:



Detroit Locker

Detroit Locker Automatic Locking Differentials

The Detroit Locker is a 100% Automatic, Wheel Speed Sensitive locking differential that provides Legendary Traction and Unmatched Durability!

The professionals at West Coast Differentials are the Detroit Locker experts! We will make sure you get the ideal locking differential or positraction for your vehicle. We also match any legitimate competitor’s advertised in-stock price, and make sure you get the locker that fits your vehicle and your performance needs.

  • Most applications are IN STOCK and READY TO SHIP same day!

  • We also stock Eaton Posi Limited Slip and E-Locker Service Kits.

Check out the DETROIT LOCKER FAQ’s page

Call the Detroit Locker experts at West Coast Differentials today for pricing, application information and expert technical advice at: (800)375-6849

Not sure which Locking Differential or Posi is the right one for you? No problem! Our Differential Professionals are here to help Monday thru Friday, 8am to 5pm Pacific Standard Time.




Detroit Locker FAQ’S

What kind of oil should I use? Can I use synthetic? Do I need friction additive/modifier? A quality petroleum/mineral based oil works best in the Detroit Locker units. We do not recommend synthetic oil. Friction additive/modifier is not required.

Can I use the stock bearings? In most cases the Detroit Lockers work with the factory (stock) bearings. The exceptions are: 10 bolt 8.5\8.6 GM axles, the “Performance” Dana 35 & 44 and GM12 bolt with 35 spline axles. No other “special” setup is required. What kind of break-in is required? The Detroit Lockers do not require any break in.
When does a Detroit Locker lock? The Detroit Locker is locked up 100% in a straight line or if you are spinning. The unit unlocks in a turn for the wheel that is turning the fastest.
When I step on and off the gas pedal, I hear the unit make a “clunking” noise. Why? Because Detroit Lockers have “backlash” or “slack” between the drive and driven teeth and you will hear this in everyday use going through corners and when going from drive mode to coast mode. Also with the vehicle on the ground and the transmission in neutral you will have 1\4 to 1\3rd of a turn of lash in the driveshaft, this is completely normal.
Can I run a Detroit Locker on the street? Many people do use the Detroit Locker during everyday street use. The Detroit Locker is a very aggressive differential, so you will hear it and feel it everyday on the street. Eaton makes many applications for trucks that spend most of their lives on the road. (In the late 60’s, some Ford cars had the Detroit Locker as a factory option.) How much horsepower and torque will the Detroit Locker take? There are many factors to consider when determining if a specific differential will last in your vehicle. Horsepower and torque are important factors. However, the weight of the car, tire height/width, the terrain and suspension are all important things to take into consideration. For example, a setup that uses street tires will live longer because both tires will break loose and spin before any real strain is put on the unit. But as the tire gets wider, the stress on the unit increases because the traction is greater. When in doubt, the best bet is to call us with your specific application and driving conditions. But also keep in mind that the Detroit Locker is the strongest unit sold today and has been for many years.
Can the Detroit Locker be used in the front axles? Yes they can, but you must have lock out hubs and they MUST be unlocked for on- road driving because of steering issues.
Can the Detroit Locker be repaired? Yes they can. Should you need to repair a Detroit Locker parts can be purchased from any of our dealers. Call Eaton Customer Service so we can provide a blow up of the unit that shows all the part numbers and help you find out exactly what part numbers you need to purchase. At that time we can even recommend a company to buy the parts from.
What is the warranty? The Detroit Locker unit is covered for one year from date of purchase against defects in materials and workmanship. The unit is not covered if the failure of another part (axle shaft or ring & pinion) damages the unit.

ARB Differential Bearing Puller Kit


 Differential Bearing Puller Kit from ARB Air LockerDifferential Bearing Puller

ARB’s new Differential Bearing Puller Kit is a professional tool that no automotive differential installer should be without.

As original equipment differential bearings have become more expensive and often difficult to source, it has been increasingly important to attempt to remove the original bearing without causing any damage to it. This specialty tool offers a unique way of removing a differential carrier bearing without the need to get access under the seating face of the bearing cone. The ARB Differential Bearing Puller Features:- Quickly and easily removes the carrier bearings from most automotive differentials- Removes without the same level of risk of carrier bearing damage and Air Locker seal surface damage damage associated with most commercially available bearing pullers.

– Able to remove many bearings that standard bearing pullers cannot

– Works with most models of ARB Air Locker and OEM differential centers

– Comes in a durable carry case with a dedicated powder coated parts tray for easy storage and transport


Contact one of our
rear end parts experts today for more information.


Chromoly Axle Shafts for the Jeep JK Wrangler

Jeep JK Wrangler Performance Chromoly Axle Shafts

West Coast Differentials stocks Sierra Gear Chromoly axle shafts for the Jeep Wrangler JK.

Sierra Gear Chromoly axle shafts have a 10 year warranty, are built for high performance use and are far more durable than stock axle shafts. These axle shafts are available for all Dana 30 and Dana 44, Rubicon and non-Rubicon models, including a 35 spline Dana 44 upgrade axle kit that can be installed with various locking differentials. Front axles use the stronger JK 1350 U joint, unlike some axle kits that use a 1310 U joint. View our Catalog or Contact our sales department for more information


Differential Repair Service

Ring and Pinion Service is the Sacramento area’s best and most experienced full service differential repair shop for AMC, Chevrolet, Chrysler, Dana, Ford, GM, Jeep and Toyota axle assemblies.

Same Day Service

Ring & Pinion Service offers same day service for most differential repair and custom differential installations. All differential and axle parts are in stock and ready to install today! Contact us for a quote.

Differential Upgrades

Ring & Pinion Service stocks and installs all ring and pinion gear ratios, differential bearing repair kits, open, limited slip and locking differentials, stock and Chromoly axle shafts, and much, much more!