and splitting the tractor opens up a "may as well." Since the labor is more involved, you may as well replace the clutch, may as well replace the IPTO shaft, may as well replace the TA...etc. Some places will sell you all the jobs whether it needs it or not (most are at least honest enough to actually put the parts in they said they sold you). Other places will do as little as you request whether something else truly needs attention or not, and others will inspect the other parts and communicate with you what really needs to be done and work out a plan with you.
If you don"t know the repair history, you may be in for some surprises--done at a shop, 800 becomes 1600 easily. If you chose to tackle this yourself, find a mechanical minded friend with some experience to help you inspect those other parts that are easy to change once you are in there.