Aren't the 40 series the real wide ones like what come on a Muggy? If so why would you put those on there. Get a set of Proline LPR's half inch offset with some hub extensions and it will handle like it is on rails. You need the hub extensions just to make it as wide as it was with the stock wheels because the stock ones are I think a 1" offset. If you do not do that your monsoon will be narrower than before and not handle as good because you CG will be higher.