my 04 x has 10 tooth drivers and 23/43 gears and rips top end and out of the hole we are trying to simulate that ratio! there is plenty of room for a 10 tooth driver so i'm pretty sure clearance won't be an issue! his sled just seems to reach a certain speed/rpm 7800/8000 and won't go any faster 100mph if that! just trying to determin should we play with gears, clutch, tried gears a little but really didn't change much, i drove his and it has no where near the pull or take off mine has! any suggestions would be greatly appreciated!crash said:why would you want 10 tooth? you might see a little less rolling resistance, but i would think there would be clearance issues and your gearing would be off.