heep70 Posted July 29, 2005 Share Posted July 29, 2005 What are the gear ratios in my 1986 GL Dual Range 5 speed manual transmission? I am trying to figure out how fast I am really traveling MPH with the 26" tires. I can use this formula if the 5th gear was a 1:1 ratio. RPM = (MPH X Gear Ratio X 336) / Tire Diameter OR MPH = (RPM X Tire Diameter) / (Gear Ratio X 336) Quote Link to comment Share on other sites More sharing options...
mcbrat Posted July 29, 2005 Share Posted July 29, 2005 What are the gear ratios in my 1986 GL Dual Range 5 speed manual transmission? I am trying to figure out how fast I am really traveling MPH with the 26" tires. I can use this formula if the 5th gear was a 1:1 ratio. RPM = (MPH X Gear Ratio X 336) / Tire Diameter OR MPH = (RPM X Tire Diameter) / (Gear Ratio X 336) you can plug in your tire sizes here for a multiplier.... http://www.miata.net/garage/tirecalcold.html Quote Link to comment Share on other sites More sharing options...
mcbrat Posted July 29, 2005 Share Posted July 29, 2005 or here are the ratios.... http://www.ultimatesubaru.org/80s/mick/gear-ratios.htm Quote Link to comment Share on other sites More sharing options...
heep70 Posted July 29, 2005 Author Share Posted July 29, 2005 Thanks! Quote Link to comment Share on other sites More sharing options...
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