Isotropic Superfinishing – Ring & Pinion Gear Polishing

Isotropic Superfinishing - Gear Polishing Service - West Coast Differentials Ring and Pinion Gears

In-House Isotropic Superfinishing – 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

Isotropic Superfinishing Gear Polishing REM Polish ISF Gear

At West Coast Differentials, we take pride in what we do. Our specialty is Differentials, Gear and Axle parts and our focus is on those things only. This has allowed our parts and tech team to become experts in their field.

We are technical advisors and problem solvers, not just order takers. As of 2023, our parts specialists have more 90 years of combined experience.

We only sell differential and axle internal parts for rear-wheel and four-wheel drive vehicles. We don’t sell parts for front wheel drive vehicles or transaxles. We don’t sell housings or brake parts. We don’t sell steering parts like rack and pinions or tie rod ends.

 At West Coast Differentials, we make the difference!