SECTION 172 1 TRUCK SERIES TOO Y5 O 17285 SPEEDOMETER GEARS HOW T0 FIND SPEEDOMETER DRIVE and IlRI l EN GEAR PART NUMBERS There are two ways oi determining the part number of a speedometer drive or driven gear BY IDENTIFICATION or BY APPLICZATION BY IDENTIFIIIZATION YOU MUST KNOW Physical shape Number of teeth Identification number EXAMPi E DRIVEN GEAR 17271 or 171522 DRIVE GEAR 17285 Physical shape conforms to Physical shape conforms to TYPE 3 TYPE 4 NUMBER OF TEETH 13 NUMBER OF TEETH 4 IDENTIFICATION NUMBER TFBP 171522 A IDEiI lTIFIlZZATION NUMBER C4TA 17285 A PART NUMBER listed is B8T 17322 A PART NUIVIBIER listed is 34TZ 17285 A BY APPL ICA TION YOU MUST I NOVli Year Transmission Rear axle Ratio Tire Size EXAMP E YEAR 1973 REAR AXLE RATIO 5 83 to 1 TRANSMISSION New Process 435 TIRE SIZE 7 50 x 20 DRIVE GEAR part number listed is C4TZ 17 285 A DRIVEN GEAR part number listed is BBT 17322 A 1 i1 i October 1986 cc Pvnil HToie ias Form Moron D EAFIBORN ll IICHIGAN COMPANY New Issue