I once ran a Saab tranny into the ground, though it didn't leak like
yours.  Eventually you will either loose several or all gears.

If you want to get home and don't care about having a rebuildable core,
keep going and add oil.  I'd recommend a max speed of 50 and staying in
the outside lane so you can roll onto the shoulder when it goes.  Don't
bother with any stop leak products, they are for drips, not floods!

Good luck!

--
Stuart MacMillan
Seattle

'84 Vanagon Westfalia w/2.1
'65 MGB (Daily driver since 1969)
'74 MGB GT (Restoring sloooowly)

Personal mechanic for:
'70 MGB GT (Daughter's)

Assisting on Restoration (and spending OPM):
'72 MGB GT (Was daughter's, now son's)
'64 MGB (Son's)

Stripped and gone but their parts live on:
'68 MGB, '73 MGB, '67 MGB GT