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If its just a little leak don't put in those Stop Leak products, instead slide a small pan available at any Dollar General under where you regularly park. If any consolation, modern Transmissions in Hot Rods & Classics that set a lot drip from the seals too. Do check it occasionally though.
If the leak is pretty bad its probably coming from the front seal and requires removal from the car to replace. If the transmission works good otherwise, I suggest having it repaired unless your capable and have a trans jack, stands, etc.
Many Trans shops are reluctant to do 'major' repairs on an older Trans since they don't have the Manuals, Senior Mech's have retired, and/or a Source for necessary parts, however, if your Trans works good and just needs a front Seal its a simple replacement job for them. Shops may say cant find a new Seal or Torus Gasket but our Club has a Source for whatever Parts needed. The Supplier for Seals, Gasket and whatever parts needed is Dave Edwards 781 449 2065 www.autotrans.us.
Additionally, Most Towns/Cities have a local Tranny Shop and if you obtain the Parts they have the Equipment to do the Job, and R&R a Front Seal doesn't really need a Manual for an experienced Tech. I would replace the rear seal too....Lastly, If the BW Trans has other problems and needs rebuilt, I suggest find a more durable Hydro to rebuild.