"OGAE,SHIM BACKLASH;USED TO CALCULATE CENTERLINE AND MOUNTING DISTANCE OF THE PTO-TO-APU BORE IN P/N 3620510-7 GEARBOX HOUSING FOR PROPERLY SPACING THE P/N 3620540-1 BEVEL GEAR THROUGH SHIMMING OF THE 3620058-1 SHIMS TO OBTAIN PROPER WEAR PATTERN AND BACKLASH;CONSISTS OF TWO PLUGS THAT WILL FIT INTO THE CLUTCH BORE AND THE PTO-TO-APU BORE PROVIDING,THROUGH CALCULATION,A BUILD DIMENSION AND THUS A KNOWN VALUE OF SHIMS THAT MUST BE INSERTED TO OBTAIN THE BUILD DIMENSION"