Is it leaking out of the shifter cable sheath or the O rings around the tranny bungs? If the sheath you might be able to fix that with a piece of Viton fuel line hose slipped over the skinny end long enough to cover the bad part of the cable housing and then use screw type hose clamps on each end work shruggy
It has been done that way more than once shruggy

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)