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Author	Topic: Correct speedo cable driven gear
Gary Gearhead Posts: 713 From: Sarasota, Fla. USA Registered: Jun 99	posted 07-03-2001 08:04 AM Id like to double check my findings: (6) tooth gear in trans. Final rear ratio 3.90 Tire dia. 31" How many tooth gear do I need for the end of my speedo cable for correct mph readings? I came up with 15.22 Is this correct? I think I should order a 15 tooth 3A gear for my 4sp. manual--right? IP: Logged
svt522 Journeyman Posts: 53 From: Hampton, Va Registered: Jul 2001	posted 07-03-2001 08:19 PM Check out the following site! http://www.bgsoflex.com/speedo1.html ------------------ svt522 1996 SVT Cobra (#522) 1967 F100 351C 1973 "Q" Code Mach1 IP: Logged
SteveLaRiviere Administrator Posts: 31026 From: Saco, Maine Registered: May 99	posted 07-03-2001 09:03 PM quote: Originally posted by Gary: Id like to double check my findings: (6) tooth gear in trans. Final rear ratio 3.90 Tire dia. 31" To figure tire revolutions per mile: 63360/[tire diameter x PI] 63360/31 x 3.14156 = 63360/97.388 = 650.59 rev. per mile. A 31" tires revolves 650.59 times per mile. So, Driven gear=[drive gear][axle ratio][tire rev .per mile]/1000 Driven gear=[6][3.90][650.59]/1000 Driven gear= 15223.806/1000 = 15.22 So you are right on, Gary. ------------------ '70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open '72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok '94 F-150 XL 5.8L/E4OD/3.55 Limited Slip '97 Probe GTS 2.5L DOHC {Wife's car...} All Fords since 1977 IP: Logged

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