I would highly recommend using Cast Weights on your Tractor. Calcium Chloride (and other forms of liquid weight) are generally not recommended by Deere and other Manufacturers' they will ONLY recommend them as a last resort-why?
For one, you are greatly decreasing the Tires' ability to flex, which aids in Traction and well as ride quality. Number two, it is difficult to have the correct Ballast for differing Field Operations, such as Plowing versus Rotary cutter usage. You should add and remove weight for optimum Tractor performance as well as Drive Train longetivity. Most Tractor Manuafacturer' want 8-14% of wheel slip under load-again this is in regard to Heavy Draft operations, such as Plowing.
Have you ever seen a flat Tire wth Calcium? It is a huge mess, and, in my area, fewer and fewer Tire Companies are willing to go out in the Field and repair them. Also, the rust out factor is another concern.
Bite the bullet-you paid a lot for your Tractor-it is and Investment, and, if cared for properly will appreciate in value over time (especially if it's green). One Transmission job will convince you that they are worth it. Cast Weights are not all that expensive, are generally easy to take on and off-you do not want to tie that Tractor to the ground!