hi, I ran 5.13 gears changed to 5.57 , dropped .3 tenths in 1/4 mile, gained one mph in speed. in 1/8 mile was bout 1 1/2 tenths. mph was faster also. gear ratio is leverage, I ran 29.5 tires with 5.13, 30" tire with 5.57 gears. like anything else need to tune it to get gains. if gear ratio wasn't important, then should run 3.91. leverage is basic physics, can move more and easier with longer lever. just food for thought. btw , 340 duster car
