Hurrey's Pinion & Caster Wizard
Rear axle LEFT, frame MIDDLE, front / driveshaft RIGHT. Use this to visualize working angles,
compare against baseline specs, and make smarter calls on pinion vs. caster trade-offs.
All angles are referenced to level ground (0° = perfectly level).
Setup Inputs
JK · JL · TJ · LJ · Bronco
Front Axle – Caster & Front Driveshaft
Rear Axle – Rear Driveshaft & Pinion
Control Arm Changes – Caster / Pinion Estimator
Angle Summary
Using preset spec
Front Axle – Caster & Working Angle
–
Enter angles to calculate.
Rear Axle – Pinion vs Driveshaft
–
Enter angles to calculate.
Start by selecting vehicle/platform, then enter measured angles (use an angle finder on the driveshaft and
yokes). This wizard will compare against typical caster and pinion targets for that platform.
Shop Note: This tool is a visual aid, not a substitute for professional alignment specs.
Angles shown are approximate and assume flat, level ground and factory reference points.
Always road test, verify driveshaft/u-joint operating angles, and re-torque all suspension hardware.
Rear Pinion vs. Driveshaft
DS: –°
Pinion: –°
Diff: –°
In this view, the rear axle housing is on the left, the frame sits in the middle,
and the driveshaft/transfer case are on the right. The angle between the driveshaft and
the pinion yoke is your working angle – keep it small but not zero.
Front Caster & Driveshaft
DS: –°
Pinion: –°
Caster: –°
Here you’re looking at front caster (steering axis tilt) and the relationship between the
front driveshaft and the front pinion. More caster = better straight-line feel,
but lifting and rotating the pinion to help the CV shaft can trade that away.
Need help deciding what fits your build?
Use Hurrey's tools and reference pages to narrow down fitment, compare options, and talk to the shop before ordering.
Fitment Tools
Offset, tire, and clearance calculators used to plan builds more confidently.
Fitment Library
Vehicle-specific wheel and tire reference data for faster research.
Services
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Contact the Shop
Reach out if you want a second opinion before checking out or booking service.
