I have the earlier trans with no seal. So far as I can tell the front seal has never leaked despite being parked nose down on a fairly steep hill for months at a time.
The rear, however started leaking when the splines got loose. I tried a speedy sleeve on the yoke but eventually ended up replacing the yoke, which also cured an annoying vibration. They are NLA new but I found an NOS one on ebay.
