Isuzu 2000 Trooper Workshop Manual page 302

4A1–14 DIFFERENTIAL (FRONT)
7. 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 indi-
cates 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 ex-
amination reveals pinion depth code "0", the pin-
ion is "nominal".
425RS023