Before you purchase parts…

Please read this before you buy parts from us.

At West Coast Differentials we have always supported our wholesale customers by not competing with them. We do not sell parts online, and have never gone out of our way to pursue retail sales. Nonetheless, we do sell parts to retail customers on a will call and mail order basis to those that are capable of installing parts themselves.

That brings us to the point of this post…

If you are planning to have a shop install your parts, we strongly recommend that you have the shop / installer purchase the parts.
Here’s why:
  • Most shops will not provide a warranty on parts you buy elsewhere. This creates a hassle for everyone if the parts fail, not to mention the delay caused when customer provided parts are incorrect or incomplete.
  • The professional mechanics at your local shop can order just the high quality parts they need for your job without paying for extras.
  • Most shops are owner operated family businesses that make a small profit on the parts they sell in order to pay for the tools and equipment needed to install them.

Help keep your local shop in business!



REM Polish ISF Gear Finishing Race Polishing Service

Isotropic Superfinishing – Ring & Pinion Gear Polishing

In-House Gear Finishing Service

Simply put, Isotropic Superfinishing significantly reduces the surface imperfections that remain after a Ring and Pinion Gear set is manufactured. The result is a cooler, quieter and longer lasting gear set.  At West Coast Differentials, the process we use is chemically accelerated vibratory surface finishing. This is technically not a polishing process, however the resulting finish does have a polished appearance. This process eliminates surface imperfections without removing material or changing the physical dimensions of the part.
This finishing process is widely used in racing applications where a conventional break-in process is not feasible, and where optimum performance is not an option.


  • Reduced Friction
  • Reduced Contact Wear
  • Reduced Heat
  • Increased Durability
  • Improved Oil Retention
  • Lower Operating Temperature
  • Reduced Noise & Vibration
  • Increased Fuel Economy
  • Reduced Break-In Requirements
  • Reduced Maintenance



We can Superfinish Ring & Pinion gears for practically any vehicle. Our extensive inventory of OEM and Aftermarket gear sets allows us to process and deliver your gears in the shortest possible time. Normal processing time is 1-2 days, depending on current scheduling.

Please call our Gear, Axle and Differential Parts specialists for details, pricing and scheduling.

(800) 642-0950

Gear Polishing REM Polish ISF Gear

True Track Limited Slip 14 Bolt AAM

Detroit Truetrac for AAM 10.5″ GM 14-Bolt Axles


10.5 Corporate 14-Bolt Detroit Truetrac Differential

Eaton Performance Products has announced the new Detroit Truetrac for AAM 10.5″ (GM 14-Bolt) Differentials!

This differential is commonly found in 3/4 and 1-Ton GM Trucks and commercial vans.The proven helical gear design of the Detroit Truetrac eliminates the need for wearable parts, resulting in maintenance free traction recognized not only for its toughness, but its smooth and quiet operation as well. Proven design, low cost 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!

  • Smooth operation
  • Performs as an open differential until traction is needed
  • Fully automatic traction differential

Contact our Sales Department for more information.


Detroit Truetrac V8 Camaro 8.6

2010+ V8 Camaro Differential


2010+-Camaro-Differential Parts

Late Model Camaro Differentials –

The 2010+ V8 Camaro uses a 10-Bolt GM 8.6″, & 218mm axle. West Coast Differentials offers an variety of Chevrolet Camaro differential and axle parts for 2010 and newer V8 Models.

Available parts include the AAM TracRite PC Limited-Slip Differential, Eaton’s Detroit TrueTrac, Ring & Pinion Gear Sets, Bearings, Install Kits & Seals.

The AAM TracRite PC (Plate Clutch) Traction Enhancing Differential is configured to bias torque to the high-traction wheel, based on torque input.

Another available option is Eaton’s Detroit TrueTrac, a maintenance-free helical gear type limited-slip differential.

Available ring & pinion gear ratios include 3.08, 3.23, 3.27, 3.45, 3.73 and 3.91. 

For more information call our Sales Department at (800)510-0950 or check out the Application Guide for Camaro