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Speedo gear needed #188435 01/09/09 12:19 PM 01/09/09 12:19 PM
Joined: Jan 2003 Posts: 9,982 Ansonia, CT C CJK440 OP master
CJK440 OP master C Joined: Jan 2003 Posts: 9,982 Ansonia, CT	I have a 27" tall tire and 3.73 gears. What speedo gear should I use. The archives show 3.55 and 3.91 only of course. 2017 Contusion Blue Challenger T/A 392 M6 "BLKNBLU"

Re: Speedo gear needed [Re: CJK440] #188436 01/09/09 12:25 PM 01/09/09 12:25 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	You might put a piece of flat stock on top of one of your rear tires & measure the EXACT distance to ground. Tire mfr listed heights are usually not dead on accurate & this could tip you one way or the other on which pinion gear to select. live every 24 hour block of time like it's your last day on earth

Re: Speedo gear needed [Re: CJK440] #188437 01/09/09 12:32 PM 01/09/09 12:32 PM
Joined: Jan 2003 Posts: 2,734 Charlotte, NC 4 446acuda master
446acuda master 4 Joined: Jan 2003 Posts: 2,734 Charlotte, NC	If tire is slightly less than 27" go with 37 tooth, if slightly more than 27" go with 36 tooth. If it is exactly 27" it would be a toss up between the two.

Re: Speedo gear needed [Re: 446acuda] #188438 01/09/09 02:25 PM 01/09/09 02:25 PM
Joined: Aug 2007 Posts: 6,095 Valencia, España NachoRT74 master
NachoRT74 master Joined: Aug 2007 Posts: 6,095 Valencia, España	simply 36 tooth... no more no less With a Charger born in Chrysler assembly plant in Valencia, Venezuela

Re: Speedo gear needed [Re: NachoRT74] #188439 01/09/09 02:33 PM 01/09/09 02:33 PM
Joined: Jan 2003 Posts: 9,982 Ansonia, CT C CJK440 OP master
CJK440 OP master C Joined: Jan 2003 Posts: 9,982 Ansonia, CT	Tire is actually supposed to be 26.8. Its a G70-14. 2017 Contusion Blue Challenger T/A 392 M6 "BLKNBLU"

Re: Speedo gear needed [Re: RapidRobert] #188440 01/10/09 05:15 PM 01/10/09 05:15 PM
Joined: Jan 2003 Posts: 25,801 Rio Linda, CA John_Kunkel Too Many Posts
John_Kunkel Too Many Posts Joined: Jan 2003 Posts: 25,801 Rio Linda, CA	Quote: You might put a piece of flat stock on top of one of your rear tires & measure the EXACT distance to ground. What about the flat spot on the bottom of the tire? Measuring the actual circumference is the most accurate way. The INTERNET, the MISinformation superhighway

Re: Speedo gear needed [Re: John_Kunkel] #188441 01/10/09 06:08 PM 01/10/09 06:08 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	If the circumference dimention makes a more accurate read for this then I will start doing that & not recommending checking the height. I did use the piece of stock to get the height on my 65 dart to select the pinion gear & it's dead on but yeah the stackup of tolerances as in the tire dimention may have just worked out in my favor in this case. live every 24 hour block of time like it's your last day on earth

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