NOTE: The "A" diameter has a machined flat to clear the pinion support in Ford 9" rear ends. Additional relief may be needed for individual applications. When using the "A" diameter in Dana 60s, the machine flat should be positioned at 90 degrees to the cap parting line.
6) Slide the Indicator and Cross Shaft as close as possible to pinion gear, minimizing any overhang of the Target Plate. Be sure to retract the indicator plunger shaft just enough to clear the Target Plate to prevent bending the indicator.
7) Make sure the Indicator shaft end is seated on the target plate and note the reading on the dial. Multiply the small counter number by 0.100" and add the thousandths pointer reading to get your INDICATOR READING. Subtract your INDICATOR READING from the CALIBRATED DEPTH (3.375 for the long calibration tube, 2.500 for the intermediate, and 1.900 for the short) and you will have obtained your MEASURED PINION DEPTH.
Example: If the reading on the indicator were 0.778" (seven complete revolutions plus reading), subtracting from 3.375 would equal 2.597". This is the MEASURED PINION DEPTH.
NOTE: To minimize error, rotate the pinion gear to at least four different positions and average the three most similar readings.
8) Compare the MEASURED PINION DEPTH to the Pinion Depth number inscribed on the pinion gear or obtained from the OEM Gear Section to determine the amount of shims to be added or removed.