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INTRODUCTION

GM performance differentials are typically divided into the two types: the 10-bolt and the 12-bolt. The reality, however, is much more detailed than that. There are numerous “10-bolt” rear ends, and two “12-bolt” units; each has its own benefits and drawbacks. The purpose of this book is to help you determine which type of housing you have, what you need for your application, and most important, how to rebuild it.

In this book, I cover identification, inspection, parts selection, disassembly, modification, assembly, and proper setup. The key to any rear differential build is in the setup. Gear mesh and pinion depth are crucial to ensure a long life for your new parts.

If you select the wrong parts and gear ratios for your application, you could make things worse. Here, you will find details on how to select the proper gears for your application, including how tires affect the gearing and how power is transferred to forward motion. A chapter is included on drivelines, along with features on brakes so that you have the most accurate information needed to make the right decisions on parts.