Yes it will bolt up, but you will need to use the shifter linkage for the 13-45 as it is slightly different. Check the rear driveshaft for mating to the 13-45 if the yoke is not the same, although it should be, and the width of the two cases is fairly close to the same. If you have the push-button or electric shift on your 13-56, it will be a lot more work adding the floor shifter.