Page 155 of 2008 Performance Parts by Ford Racing Performance Parts

10.25 8.8 ring gear and pinion sets part number ratio axle m-4209-f308 shown mustang/ranger/f-150 3.08:1 8.8 3.27:1 8.8 3.55:1 8.8 3.73:1 8.8 4.10:1 8.8 4.10:1 8.8 4.30:1 8.8 4.56:1 8.8 5.4l f-150 expedition navigator f-250/350 m-4209-k410m 4.10:1 10.25 rear m-4209-k456m 4.56:1 10.25 rear m-4209-f308 m-4209-f327 m-4209-g355a m-4209-f373n m-4209-g410a m-4209-g410m m-4209-g430m m-4209-g456 notes these ring and pinions have been developed to increase towing capability of 5.4l expeditions replaces our popular m-4209-f373 new manufacturing technology utilizing a face hob process which features a single-pass pinion tooth machining operation compared to a conventional three-pass process for machining cnc cut and lapped gear teeth higher strength and better quality gears are produced with the face hob process note these new gears look a little different the gear teeth are cut on a different angle and the ring gear has a bevel on the back of the gear speedometer gear usage chart 7.5 and 8.8 axle the chart specifies the driven gear recommended to obtain approximately correct mph readings when the listed ford racing ring and pinion gear sets are used in conjunction with the indicated speedometer drive gear and mustang original equipment 15 16 17 tires 800-815 revolutions mile a dash in the chart indicates that particular combination cannot be obtained if you are using oversize/undersize tires obtain the revolutions/mile information from the tire manufacturer and plug it into the formula below the part numbers of the various speedometer drive and driven gears are shown in the charts the gears can be obtained from any ford and lincoln-mercury dealer they are not available from ford racing the drive gears on t-5/t-45/srod tremec manual transmissions can be changed the drive gear on ford rear-wheel automatic transmissions is machined into the output shaft changing the drive gear is impractical since it requires a new output shaft and transmission teardown most have 7 or 8 teeth speedometer driven gear teeth drive gear teeth axle ratio 6t 7t 8t 3.08 3.27 3.45/3.55 3.73 4.10 4.30 ­ 16 17 18 20 21 18 19 20 21 ­ ­ 20 21 ­ ­ ­ ­ notes used in most vehicles with v-8 and t-5 transmissions from 1983-89 and 1996-98 cobra with t-45 transmissions used on 1990-95 mustang v-8 with t-5 transmissions and 1996-98 mustang gt with t-45 transmissions discontinued auto trans driven gears 17271 number service of part teeth color number t-5 manual trans drive gears 17285 number service of part teeth color number manual trans driven gears 17271 number service of part teeth color number chassis components 6 7 8 black yellow green 17285 e3zz-b e3zz-a f0zz-a t-45 manual trans drive gears 7 8 f6zz-aa f6zz-ba 16 17 18 19 20 21 wine white yellow pink black red c0dz-a c3dz-c c0dd-b c0dz-b c1dz-a c4oz-a 16 17 18 19 20 21 blue green gray tan orange purple d0az-a c7sz-a c7sz-b c7vy-a c8sz-b d0oz-b special applications driven gear calculation example step 1 step 2 if your axle/tire combination is not in the above charts you can calculate the number of teeth required on the driven gear by using this formula · · · · t-5 trans drive gear teeth 7 axle ratio 3.73 tire rev per mile 815 225/60 vr15 step 3 you would select driven gear with closest whole number of teeth which would be the 21-tooth c40z-17271-a part driven gear teeth drive gear teeth x axle ratio x tire rev per mile 7 x 3.73 x 815 21.3 driven gear teeth 1000 1000 not legal for sale or use on pollution-controlled motor vehicles direct replacement part see pages 2-8 for important safety emissions and warranty information www.fordracingparts.com 153

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