To select correct shim thickness for new gear set, note following: Using micrometer, measure thickness of original shim removed from axle and use same thickness in reassembly of replacement carrier unit or drive pinion. If further shim change is necessary, it will be noted in a tooth pattern check. If original shim is lost, use a nominal shim and make a tooth pattern check.
CAUTION:
Ring gear and pinion are installed as a matched set. Be sure same identifying number (painted in white) appears on ring gear and pinion head.