Transmission mount 19mm top nut on 4Speed 240D will not come out

[MyOld240D]

I am at the end of my rope with this nut, exhausted tired dirty and I smell like coolant, oil and diesel fuel after replacing my head gasket today.

I have tried with all the strength I have to get this nut to turn. I've even removed my transmission support to let the transmission hang down but, it still doesn't give me enough room to get a ratchet on it.

Other than sawzall-ing through the mount and then trying to find a new nut tomorrow, what are my options?

I have tried PB Blaster... a sledge hammer on the wrench... oh that nut is not rounded... the wrench snapped in 2 though...

Please help.

And no, I don't know why I decided to tackle this after doing a head gasket. I just want that old mangled mount out of there.. it is the original mount and it is cracked and rotted and sludgy..