Pinion Center Measuring Tool

The Pinion Center Measuring Tool by Moser Engineering is a precision instrument designed for professional technicians and serious enthusiasts performing differential assembly and pinion bearing installation on a variety of late-model and classic platforms. This specialized jig ensures accurate pinion gear centering—a critical step that directly affects ring-and-pinion mesh geometry, load distribution, and long-term durability of your differential assembly. Whether you're rebuilding a Ford 9-inch, Dana 60, GM 12-bolt, or Mopar 8.75-inch rear end, proper pinion centerline positioning prevents premature wear, noise, and potential catastrophic failure under hard use.

Manufactured from durable stainless steel, the Pinion Center Measuring Tool delivers repeatable accuracy and resists corrosion in shop and storage environments. The compact design—measuring 14.9 inches in length with a 0.3-inch profile—fits easily into tight differential housings without obstruction, allowing you to measure pinion depth from the mounting surface to the gear's theoretical centerline with confidence. The tool's straightforward mechanical design requires no batteries or calibration; once properly positioned against the ring gear, it provides instant visual feedback for pinion shim selection and bearing preload adjustment, eliminating guesswork and reducing the likelihood of costly mistakes during reassembly.

Professional rebuilders, transmission shops, and dedicated gearheads performing custom rear-end builds will find this tool indispensable for achieving factory-correct or optimized pinion bearing preload and mesh contact patterns. It is compatible with the four most common domestic differential housings listed above, making it a versatile addition to any serious modification or restoration project. At 0.88 pounds and included as a single unit, this measuring jig becomes a permanent part of your shop's differential assembly toolkit, paying for itself on the first major rebuild and ensuring consistent, reliable results for years to come.