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Going to 15" ralleys soon on my Duster #1739889 01/27/15 02:53 AM 01/27/15 02:53 AM
Joined: Aug 2004 Posts: 8,087 Elk Grove, Calif. B bigblock340power OP master
bigblock340power OP master B Joined: Aug 2004 Posts: 8,087 Elk Grove, Calif.	What, if any changes should I make to my speedo gear in the trans. to keep my speedo accurate?

Re: Going to 15" ralleys soon on my Duster [Re: bigblock340power] #1739890 01/27/15 05:54 AM 01/27/15 05:54 AM
Joined: Feb 2010 Posts: 18,493 Granite Bay CA Kern Dog Striving for excellence
Kern Dog Striving for excellence Joined: Feb 2010 Posts: 18,493 Granite Bay CA	Tires of a larger diameter will require a smaller speedometer pinion. The larger tires spin fewer revolutions per mile. The smaller speedo pinion will make up for it. My 27 1/2" tires result in a speedo tooth count very close to the differential ratio. 3.91 needs a 39 tooth. The 3.55s need a 34 or a 35 tooth.

Re: Going to 15" ralleys soon on my Duster [Re: Kern Dog] #1739891 01/27/15 10:20 AM 01/27/15 10:20 AM
Joined: Aug 2004 Posts: 8,087 Elk Grove, Calif. B bigblock340power OP master
bigblock340power OP master B Joined: Aug 2004 Posts: 8,087 Elk Grove, Calif.	Quote: Tires of a larger diameter will require a smaller speedometer pinion. The larger tires spin fewer revolutions per mile. The smaller speedo pinion will make up for it. My 27 1/2" tires result in a speedo tooth count very close to the differential ratio. 3.91 needs a 39 tooth. The 3.55s need a 34 or a 35 tooth. I guess I should have put in the gear. 3.23 for the street. I know their is a chart somewhere. I'll have to look around.

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