How to Rebuild a 10 Bolt Posi?

Answer The 10 bolt Positrac differential is a rear-end differential found stock in IROC-style Chevy Camaros in the early to mid-1990s. The 10 bolt Posi is a slightly smaller version of the much heavier d... Read More »

Top Q&A For: How to Rebuild a 10 Bolt Posi

How to Tell If a Chevy 10 Bolt Is a Posi?

Aside from differences in ring gear and axle sizes, the GM 10-bolt rear axle comes in "open" and "posi" differential versions. The differential is the assembly in the center of the axle that contai... Read More »

How to Identify a 10-Bolt, 8.5-inch Posi Rear End?

When it comes to getting power to the pavement, GM's 10-bolt, 8.5-inch rear end with Positraction is a hero. Like Superman in street clothes, however, it can be hard to identify this beefy unit am... Read More »

What Is Posi Track?

Posi-Track is a shortened generic term for the GM-branded name "Positraction." It is a type of limited slip differential. To understand how limited slip differentials or LSD works, you must underst... Read More »

How do I Do a Two Bolt to Four Bolt Conversion on a Big Block Chevy?

The benefit of a four bolt main block over a two bolt is its ability to withstand very high cylinder pressures and much higher rpm. Big block engines have more mass than small blocks thereby making... Read More »