553 loader will work on a 5400 tractor in 2wd or 4wd. The downside of looking for a used 520, etc is to make sure they have the proper mounts with it as well. Mounts purchased individually for the now discountinued loaders like the 520, etc can be as much as $1,200 each side. Were also different for cab and open station units as well so purchase used carefully if you can find one to make sure you dont have to buy the mounts seperate.