lol - yea the 18 is enough.... i guess. im tempted to try the 21 tho. i got away with putting all the os 18s power thru 2 wheels, so if i keep it in 4wd the driveshafts at least will be ok, as should the diffs. with the gen spurs i reckon it might be a goer - what do u think? pushin my luck or worth a shot?