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DRIVELINE SPEED-DIAL SPEEDOMETER ADJUSTER M-4209ADPT-AC • Used to correct speedometer because of tire size or gear ratio changes • Fits 1994-2004 Mustang manual and automatic transmission • Fits 2005-2010 Mustang with manual transmission. Will correct speedometer. It has no limit on magnitude of gear ratio change for manual transmission vehicles • Fits 2005-2010 Mustang automatic transmission. Will correct speedometer to equivalent of 10% gear ratio change, higher or lower NOTE: To maintain cruise control function on 2005-2010 Mustang automatic and manual transmissions, gear change is limited to equivalent of 5% higher or lower ratio (<+/-5% change). For example, a gear change from 3.55 to 3.73 results in a gear ratio reduction of 4.8%, so cruise control will continue to operate normally. A gear ratio change from 3.55 to 4.11 results in a gear ratio reduction of 13.6%, so cruise control operation is lost. • The speed-dial scales a frequency-based vehicle speed signal up/down to maintain accurate vehicle speed indication to the instrument cluster and PCM • Easy 4-wire installation • No reprogramming of PCM necessary SPEEDOMETER GEAR USAGE CHART — 7.5" AND 8.8" AXLE The chart specifies the driven gear SPEEDOMETER DRIVEN GEAR TEETH recommended to obtain approximately DRIVE GEAR TEETH correct mph readings when the listed AXLE RATIO 6T 7T a140 8T a141 Ford Racing ring and pinion gearsets are NOTES:a140 Used in most vehicles with V8 and2018– 3.08 used in conjunction with the indicated T-5 trans mis sions from 1983-1989 speedometer drive gear and Mustang 3.27 16 19 21 and 1996-1998 Cobra with original equipment. 15"/16"/17" tires 3.45/3.55 17 20 – T-45 transmissions. (800-815 revolutions/mile). A dash in the a141 Used on 1990-1995 Mustang V8 with–2118 3.73 chart in di cates that particular combination T-5 transmissions and 1996-1998 cannot be obtained. If you are using 4.10 20 – – Mustang GT with T-45 transmissions. oversize/un der size tires, obtain the 4.30 21 – – a142 Discontinued. rev o lu tions/mile information from the tire manufacturer and plug it into the formula T- 5 MANUAL TRANS. DRIVE GEARS MANUALTRANS.DRIVEN GEARS AUTO TRANS. DRIVEN GEARS below. The part numbers of the various (17285) (17271) (17271) speedometer drive and driven gears are NUMBER SERVICE NUMBER SERVICE NUMBER SERVICE shown in the charts. The gears can be OF PART OF PART OF PART TEETH COLOR NUMBER TEETH COLOR NUMBER TEETH COLOR NUMBER ob tained from any Ford and Lincoln dealer. They are not available from Ford Racing. 6 Black E3ZZ-B 16 Wine C0DZ-A 16 Blue D0AZ-A a142 The drive gears on T-5/T-45/SROD/ 7 Yellow E3ZZ-A 17 White C3DZ-C 17 Green C7SZ-A TREMEC® manual trans mis sions can be 8 Green F0ZZ-A 18 Yellow C0DD-B 18 Gray C7SZ-B a142 changed. The drive gear on Ford rear-wheel T-45 MANUAL TRANS. DRIVE GEARS 19 Pink C0DZ-B 19 Tan C7VY-A automatic transmissions is ma chined into (17285) 20 Black C1DZ-A 20 Orange C8SZ-B the output shaft. Chang ing the drive gear is im prac ti cal since it requires a new 7 F6ZZ-AA 21 Red C4OZ-A 21 Purple D0OZ-B output shaft and trans mis sion teardown. 8 F6ZZ-BA Most have 7 or 8 teeth. SPECIAL APPLICATIONS DRIVEN GEAR CALCULATION EXAMPLE STEP 1 STEP 2 STEP 3 If your axle/tire combination is not in the • T-5 Trans. You would select driven gear with closest above charts, you can calculate the number • Drive Gear Teeth = 7 whole number of teeth, which would be of teeth required on the driven gear by • Axle Ratio = 3.73 the 21-tooth C40Z-17271-A part. using this formula: • Tire Rev. Per Mile = 815 (225/60 VR15) 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 For important information about the proper usage of performance parts, please see page 14. See pages 286-292 for important safety, emissions and warranty information. www.fordracingparts.com 183


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