Quality Differential Parts since 1982!



We stock a huge selection of Differentials. The following is an overview of the types that are available.

You can find the specific Open Carrier, Limited-Slip, or Locking Differential for your vehicle in the West Coast Differentials Catalog.

VIEW or DOWNLOAD the our current parts catalog using the links in the sidebar to the right. ⇨

AAM Open Differential

Open Differentials

An open differential allows both tires to spin at different speeds. This is perfect on dry pavement when the vehicle corners and the axles turn at different speeds, but it doesn’t work very well when one or both tires lose traction. In this situation, the tire with no traction spins, and the tire with traction does nothing. Open differentials are available as complete units, or as separate cases and internals, from both OEM and aftermarket manufacturers.

Find an open differential carrier for your specific application in our catalog

Eaton Limited Slip Differentials

Limited Slip Differentials

Limited Slip Differentials generate more traction than the open differential. Most Limited Slip Differentials, sometimes called posi’s or positraction differentials, use clutches to drive both tires, but allow the clutches to slip when the vehicle corners and the axles need to turn at different speeds. However, the Truetrac acts as an open differential but applies torque to drive the tire with the most traction.
Read more about our selection of Limited Slip Differentials

See page 65-65 of our catalog for complete Limited-Slip application listings. 

Eaton Detroit Locker

Locking Differentials

Locking differentials use various means to lock both axles so that both turn all the time. Automatic locking differentials disengage when the vehicle decelerates for corners. Selectable lockers allow the driver to engage the locking differential with a button. A locker ensures that both tires turn in all driving conditions. Lockers are ideal for more extreme off road driving. Learn more about our Locking Differentials

See page 66-69 of our catalog for complete Limited-Slip application listings. 

Differential Spool


Spools are a solid carrier that does not allow axle differentiation. Both axles turn all the time. However, spools can’t disengage like a locker, so the tires will chirp when the vehicle corners. Tire wear will increase. Spools are most often used in racing applications, and occasionally in off road applications. For Spool Application listings by vehicle make and/or Differential type, see page 66-67 of our catalog for complete Spool application listings.

2015 Product Catalog

Click the thumbnail above to view our current catalog online or Download a PDF copy and save it on your computer for offline viewing

Traction Devices

AAM Differential Kit

Open Differentials vs. Locking and Limited-Slip Differentials

Open differentials are standard equipment on most vehicles. The "Open" differential does a great job of transmitting power and propelling the vehicle forward. The design also allows both wheels to travel at different speeds while cornering, without causing excessive tire wear. The problem with the open differential happens when one tire is on a low traction surface such as ice, snow or mud. The tire on the slippery surface will spin while the other tire provides no forward motion. The animation above shows an open front differential in a 4-wheel drive vehicle. Differential upgrades that will provide power to both wheels are featured on this page.

eNews & Updates

West Coast Differentials 30 Years

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Products Available for the Following Axle Assemblies:

  • AMC Model 20
  • AMC Model 35
  • Toyota 7.5”
  • Toyota 8”
  • Toyota Landcruiser
  • Toyota Tacoma
  • Toyota Tundra
  • Chrysler 7.25”
  • Chrysler 8.25”
  • Chrysler 8.75”
  • Chrysler 9.25” Rear
  • Chrysler 9.25” Front
  • Chrysler 10.5”
  • Chrysler 11.5”
  • Dana 30 ™
  • Dana 35 ™
  • Dana 44 ™
  • Dana 50 ™
  • Dana 60 ™
  • Dana 70 ™
  • Dana 80 ™
  • Ford 7.5”
  • Ford 8”
  • Ford 8.8”
  • Ford 9”
  • Ford 9.75”
  • Ford 10.25”
  • Ford 10.5”
  • GM 55 Passenger
  • GM 55 Truck
  • GM Corvette
  • GM 7.25” Front Differential
  • GM 7.5” and 7.625”
  • GM 8”
  • GM 8.2”, GM 8.25” Front Differential
  • GM Camaro, Pontiac G8, GTO
  • GM 10 Bolt 8.5” and 8.625”
  • GM 12 Bolt Passenger
  • GM 12 Bolt Truck
  • GM 9.25” Front Differential
  • GM 14 Bolt 9.5”
  • GM 14 Bolt 10.5”
  • GM 14 Bolt 11.5”