Answers to all your Gear & Axle questions.

Differential Repair – Technical & Installation Help

Differential Repair topics including How to Identify your Differential, Select the ideal Ring and Pinion gear ratio, Install or Repair your Differential, Check your gear pattern and more!

Find a Dealer

Find the application and ratio you need? Locate a Sierra Gear & Axle Distributor near you.

Gear Calculator

Doing a gear ratio change but not sure what you want? Try our Differential Gear Calculator.