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You're gonna need a lot more tire.A LOT,more! heehee. 245s are just barely adequate for the front, but they are really hard to fit there on 15s. 275/60s are just barely adequate for the rear. As it is; stay off the gas around corners in first gear at least!If it bang-shifts in the turn, and breaks loose,you could be cutting a donut; surprise!If you are really on it, you will be up on the curb in a hurry.As other motorists around you, passing by, give you all hinds of hand signals.....Very embarrassing.
Oh wait that was me :(