Pinion Centering Jig

The Pinion Centering Jig from ALLSTAR PERFORMANCE is a precision aluminum tool engineered for engine builders, automotive technicians, and serious DIY mechanics who demand accuracy during differential and drivetrain assembly. This specialized jig ensures proper pinion gear alignment and centering, a critical step in achieving optimal ring-and-pinion mesh and extending drivetrain longevity. Whether working on street engines, race platforms, or heavy-duty applications, accurate pinion positioning directly impacts driveline efficiency, noise reduction, and component lifespan.

Constructed from durable aluminum in natural finish, this centering jig provides repeatable, hands-free pinion positioning that eliminates guesswork during critical assembly phases. The precision-engineered design accommodates various differential housings and pinion shaft configurations, making it adaptable across multiple applications and vehicle platforms. At just 0.81 lbs and measuring 17 inches in length, the jig balances structural rigidity with accessibility, allowing technicians to position it easily within confined engine compartments and differential carriers while maintaining rock-solid centering accuracy throughout the assembly process.

Professional rebuilders, transmission shops, and experienced enthusiasts benefit most from this tool when performing differential overhauls, custom gear ratio installations, or precision driveline tuning. Installation is straightforward—simply position the jig to center the pinion shaft before final bearing preload and carrier assembly, ensuring the mesh pattern and gear contact geometry meet OEM or performance specifications. Compatible with most differential types and ring-and-pinion combinations, the Pinion Centering Jig (ALL 68370) delivers the precision control that separates quality builds from average work, reducing comebacks and warranty claims while maximizing driveline performance and reliability.