Quality Differential Parts since 1982!


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Free Technical Support West Coast Differentials offers Free Technical Support before and after you buy differential parts from us. Our differential parts experts will make sure you get the right parts the first time!
Same Day Shipping At West Coast Differentials we think you deserve to have your parts as soon as possible. So most orders placed before 4pm Pacific time ship the same day!
Differential Parts Distributor We have your differential parts in stock ready to ship today. West Coast Differentials stocks a complete line of light duty axle parts for Chevrolet, Chrysler, Dana, Ford, GM, Jeep and Toyota axle assemblies.
We Make the Difference At West Coast Differentials we are committed to making your experience with us totally enjoyable. We think top notch customer service is the most important thing we do. Hence, at West Coast Differentials, We Make the Difference is much more than a slogan.

Quality Brand-Name Parts Ready to Ship TODAY!

Brand Name Differential Parts

New Products and Specials

Free ARB Air Compressors

PROMO EXTENDED until May 31st! For a limited time, get a FREE ARB Air Compressor with the purchase of any ARB Air Locker. Single purchases come with a FREE Air Locker Activation Compressor. Buy two lockers and get a FREE High Performance Air Compressor. Read More….

Complete Third Members – Built to Your Specifications

Complete Ford 9 3rd members

At West Coast Differentials, we build complete ready-to run third members for Ford 8″, 9″, Chrysler 8.75″ and Toyota. All of our 3rd members are assembled using OEM or better quality components, and your choice or Gear Ratio and Traction Device. From stock replacement to full-on race applications, we’ve got you covered.  Read more….

Wavetrac Differentials – Designed & Manufactured in the USA

Wavetrac Helical High Performance Differential Limited Slip Posi

Wavetrac® Differentials use a patented design to improve grip in low traction conditions. The Wavetrac® differential will perform a lifetime of service without maintenance or rebuilds. Designed & manufactured in the US, they come with a transferrable Limited Lifetime Warranty. Read more……

New 35 & 40 Spline ARB Air Lockers for GM 10.5 / 14-Bolt

ARB Air Locker 35 Spline 40 Spline

These Air Lockers are for the enthusiast who demands the best equipment for their vehicle or buggy.The RD234 and RD235 incorporate the latest 2-piece Air Locker design and includes forged gears and a five year, unlimited mileage warranty. Read more…

New ELocker4 for Dana 60 & 70

Stronger, Faster, Smoother. The New ELocker4 features a stronger four-pinion design for increased strength and lightning-fast engagement. Available for 30, 35 and 40 spline axles. Read more…

Ford 10.5″ Super-Duty Gear Options

Ford 10.5" ring pinion gears ratio

The popular 2011-2015 Ford Super-Duty has a Ford 10.5″ differential with a 37-spline pinion. In addition to the OEM ring & pinion options we carry, we also have affordable aftermarket gear sets in 3.55, 3.73, 4.11 and 4.30 ratios. Call for details.

Application Guides

Differential Parts Application Guide See the parts that are available for your vehicle, with direct links to our most current parts catalog.

Tech Topics

Differential Repair-Gear Ratio Calculators-setup specs-installation Instructions

Tech Topics include everything from Differential Identification to Installation Instructions and New Gear Break-In Procedure

eNews & Updates

West Coast Differentials 30 Years

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Order Parts

Our LIVE Differential Parts Experts are ready to take your call Monday thru Friday from 8AM to 5PM.

(800) 510-0950

Most orders received before 4PM Pacific Standard Time will be shipped out the SAME DAY, with next day delivery via ground service to most of the West Coast!

We do not offer Online Ordering We want to make sure you get the right parts... Simply give us a call! Let our parts specialists take the guesswork out of your order.

Parts Catalog

The most current listings can be accessed using the "Find Your Parts" link (Look for the magnifying glass!)