The full width of the TJ axle is 60.5 from WMS (Wheel Mount Surface) to WMS

60.5/2 = 30.25 (middle of the axle)

30.25 - 22.13 (pinion to driver WMS measurement) = 8.12

Pinion Offset 8.12

Disclaimer: Do not depend on this number for your Wrangler. Measure it yourself!