https://docs.google.com/spreadsheet/ccc?key=0AqPlAHiKgTwmdDhfU0NwV3BSSU95c3ZLc2VSSExzU2c#gid=0I put this crap together to help me daydream about gear ratios and to waste time in general. Let me know if this thing works for you, if you find it useful, or if you find mistakes I may have made. I spent a bazillion hours messing with it so I think I've pretty well found and fixed all the blatant math errors.
Oh yeah, It's for checking engine speed at different vehicle speeds at a glance. You just plug in your tire size, rear gear and tranny ratios to see what's up. It'll also help you find the right speedo gear for a TKO 600 or any other tranny as long as you know what speedo drive gear is in your tranny and what driven gears are available. If your stuff comes up out of whack, maybe you can find a speedo drive reducer. Plug in your reducer (or speeder-upper) ratio to see if you can find a driven gear that will work. Speedo errors are in percents, so if you see -.3 on the chart your speedo should read 99.7 MPH when you're going 100.
