Isuzu 1999 RODEO Workshop Manual page 251

4A2–18 DIFFERNTIAL (REAR)
14. Set the dial indicator to "0". Place it on the mounting
post of the gauging arbor with the contact button
touching the indicator pad.
Force the dial indicator downward until the needle has
made a half turn clockwise. Tighten down the dial
indicator in this position.
Legend
(1) Dial Indicator
(2) Ganging Arbor
(3) Plunger
(4) Gaug Plate
15. Position the plunger on the gauge plate. Move the
gauging arbor slowly back and forth and locate the
position at which the dial indicator shows the greatest
defection. At this point, once again set the dial
indicator to "0".
Repeat the procedure to verify the "0" setting.
16. After the ZERO setting is obtained, rotate the gauging
arbor until the dial indicator rod does not touch the
gauging plate.
Record the number the dial indicator needle points to.
Legend
425RS020
(1) Example=Dial indicator reading of 0.085
17. Record the pinion depth code on the head of the drive
pinion.
The number indicates a necessary change in the
pinion mounting distance. A plus number indicates
the need for a greater mounting distance (which can
be achieved by decreasing the shim thickness). A
minus number indicates the need for a smaller
mounting distance (which can be achieved by
increasing the shim thickness). If examination
reveals pinion depth code "0", the pinion is "nominal".
425RS021
425RS022
425RS023