You might have a seal going bad on you. A quick free inspection at your local Aamco dealer may answer some questions for you.
bad filter
Obviously a seal has failed.
It could be that your transmission housing is leaking. You will probably find oil underneath the machine as well.
The better question is what is leaking transmission fluid?
Because your transmission has a seal that is leaking.
The transmission could have a bad seal or have too much internal pressure causing the fluid to come from the 93 Suburban vent hole. The Fluid is probably leaking slowly, and that is why the level still shows normal.
Sounds like front pump seal if automatic-very common
try the cool line fitting from the radiator to the transmission i just had that problem on a 1994 mercury Sometimes you can leak out of the tailhousing of your transmission if the housing seal is slightly damaged
The output shaft seal has failed and transmission fluid is leaking by, and that would explain the transmission fluid appearing there.
Rear main engine seal or front transmission seals
You need to check the transmission gasket between the transmission pan and the body. If it's leaking you have to replace it.
fluid is a lubricant of transmission