Welcome to Team Talk.
After cleaning out the bilge, I would refill the trans. and run it again to see where the leak is. Should you need to pull it to replace seals, it may be worth rebuilding as long as it is out already.
I'm kind of partial to '77's. How about posting a few pictures?
Tandem Axle Wheel & Tire Package $629
4 Matte Black T08 14x6 wheels, 4 ST205/75R14 Kenda Loadstar tires
Single Axle Wheel & Tire Package $379
2 Matte Black T08 14x6 wheels, 2 ST215/75R14 Kenda Loadstar tires
MOUNT, BALANCE & FREE SHIPPING INCLUDED IN BOTH PACKAGES
CARB REBUILDING - FAST TURN-AROUND. $100 +PARTS
LED lights, Hubs, Spare Tire Carriers, Chrome & Powder Coated Lug Nuts - Red, Blue & Black
PM or email me email@example.com