I was thinking about getting 3.73's, i checked out some web sites and saw that i need a 23 tooth driven gear, i have a 8 tooth drive gear. If you do the math(i think this is how you do it) and take 23/8 = 2.875...which is no where near 3.73. If that is not how you do it how far off would my speedo be with the 23 tooth gear??