I have a 4490 that was in fine condition, low hours, that the previous owner lost the trans in. He had a guy take it apart and price new and used parts. Paid for the disassembly and sold the remainder to me for the axles. Said it was'nt worth the cost with no guaranty that it would not happen again in a few hours. Just his opinion.
Where are you located? Some people have taken the tractor apart and used the frame with rear axle as a 3 point dolly. Seems to work very well as the frame supports liquid tanks etc very well.