So much for the comparatively painless solution.

The modulator held 14" vacuum for at least 10 minutes.

More worrisome is the ATF blown all over the exhaust system. I cannot seem to locate the source, although there seems to be more on the passenger side.

Even running, I can see no leaks. I will leave it on jack stands overnight and see if I get any puddles.

It is also slipping so badly I could not get it up ramps, which explains the jack stands.

Can any of the seals be replaced without removing the trans, or should I start shopping tow trucks?