Differential and Axle Technical Help

These pages are intended to answer the most common questions and help you solve the most common problems with differential and axle identification, repair, setup, modification and problem diagnosis. If you don’t find the technical help that you need on these pages, contact us, and talk to a differential and axle expert at (800)510-0950.

Axle and Differential Rear End Identification

Differential & Axle Identification

Accurate Differential Identification is the first and most important step in your differential repair, upgrade or overhaul project. Read More

Rear End Carrier Breaks Brakes High Low Ratio Carrier

Differential Carrier Breaks

Differential carriers are designed to accommodate a range of Ring & Pinion gear ratios for the various tire sizes and vehicle applications. Read More

RPM Calculator Tire Size conversion Rear End Gear Ratio Calculator

Differential Gear Ratio Calculators

Use our Differential Gear Ratio Calculator page to determine the best ring and pinion gear ratio for your vehicle. Read More

Differential Noise Rear End Problems Howling Chatter

Differential Problem Diagnosis

Noises, vibrations and other irregular driving characteristics can often help diagnose a differential or driveline problem. Read More

Axle Length, Axle Splines, Brake Offset, Bolt Circle

How to Measure Axle Shafts

Accurate measurement of axle shafts is a crucial step in getting the right axle for your application. We stock tons of axle shafts. Read More

Broken Ring Gear Reasons Differential Broken pinion Gear

Differential Failure Analysis

A visual inspection of the failed or damaged ring and pinion gears and/or bearings will usually indicate the cause of most failures. Read More

Ring & Pinion Gear Install Instructions How To DIY

Differential Installation Instructions

By following these differential installation instructions carefully, you will achieve proper set up, hoping these instructions are helpful. Read More

What gear ratio do I need Posi Locker Open Differential

Frequent Gear and Axle Questions & Answers

Our staff of Differential Experts is ready to help with your specific axles and differentials questions Monday thru Friday from 8am to 5pm. Read More

Differential Torque Specs Ring Gear Torque

Differential Preload, Backlash and Torque Specifications

The following are recommended Differential Set-Up Specifications for various differentials. If in doubt, consult our staff of differential parts specialists. Read More

GM axle ratio identification codes G Codes

General Motors RPO Codes

GM RPO Codes, or General Motors “Regular Production Option” codes contain lots of valuable information about your GM vehicle. Read More

Differential rear end gear break in procedure

Ring & Pinion Break-In Procedure

Improper gear break-in procedures may cause overloading and overheating of the ring and pinion gears as well as break down of the gear oil. Read More

Gear Axle Differential Part Names

Axle Assembly Exploded Views

Exploded views of typical differential and axle assemblies with part names indicated.