Originally Posted by
rigor
+1
RPM Ball Cups
Extra front arms
Shock caps (i also have a spare front & rear shock shaft but never broken one)
Extra bevel diff gear sets
Diff shims (ignore the manual, shim until ZERO side to side play, usually about 6 shims on one side, 3 - 4 on the other)
Chassis film
Yup, shim until there is no side play. Usually you can't shim the diff gear more than 6 shims until you get notchy-ness due to gear mesh that is too tight. The other side is less critical, usually 2 shims for a new diff and up to 5 shims if it is a fairly used diff.