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)

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

or here are the ratios....

 

http://www.ultimatesubaru.org/80s/mick/gear-ratios.htm

Thanks!