I have included a link on the Project Turbo SideKick
site to help in the calculation of gears and tires, new
speed readings and how far off or not your mods have
made your speedo readings.
These are the easiest ones to use that I have found,
and thought it appropriate and helpful to include them
for everyone to use. Compliments of Mark at 4lo.com
Would have helped to include the link.
http://wildcatent.freeyellow.com/zookmods