Yes, a model number would be helpful. I am assuming that you have a small series tractor so I am posting additional info that does not pertain to tractors such a DKase has.
Since you have already done the rockshaft, there are two other places possible, neither one requiring COM removal.
The PTO shaft seal at the rear of the sliding gear shaft in the rear right next to the ring and pinion and the seals between the range box and the main tranny. Of course that set is a split but a very easy one. Just get everything supported safely.
Hopefully Joe can post some pics and when you get a look at it it's fairly obvious what must be done. The two back to back seals are located in a retainer between the range box and 4 speed so the box must be removed to get to them.
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