what is biggest tire

got a 99 dakota slt club cab with the 31 150 tires from factory what is the biggest tire I can put on it with out lift I am wanting to put 32 1150 but unsure if they will rub and also how do I correct the speedometer after that

31s should fit without any lifting. Anything else will require a lift. Calibrating the speedo requires a scan tool to hook up to the computer.