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Quickly visualize axle shaft placement and pinion alignment on your Ford 9" housing.
This bolt-on gauge gives you a fast and reliable way to see exactly where your axle shafts will land in relation to the pinion centerline. The machined slit marks the pinion center, while the rectangular cutout indicates the natural gap between the shafts. Whether you're building a custom-width housing or double-checking stock dimensions, this tool saves time and prevents guesswork.
The gauge helps confirm you're getting enough spline engagement — you generally only need about 75%. You can measure right up to the edge of the box and subtract roughly 1/8" for a safe and accurate reading. It’s a straightforward tool that can make a big difference when you’re cutting or ordering shafts.
You typically only need 75% spline engagement. Measure to the edge of the box and subtract about 1/8" for best results.
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