Hi Dave, good to have you aboard!!:thumbsup: A large floor jack would be just fine, you can either put it under the clutch housing or , with a plank between, under the oil pan.
Before you drop the front axle check if the play is between the steering arm and the shaft coming out of the bottom of the box. If so, slide the arm down off the shaft and check for worn key and keyway. Replacing the key may tighten it up and tighten up the lock bolt well.
If it seems to be in the box, then its probably the cone bearing on the top of the steering shaft. This bearing should be no problem to match up at a good bearing shop.
Good luck and let us know how you make out, or ask if you have any more questions.:cowboy:
BTW what is the ser# of your tractor?