I've got a 1992 SE with an AT and here's what happened:
I changed out the transmission filter, what fluid drained, replaced the pan/gasket. It was on front ramps during the change.
Well, when I tried backing it off the ramps, it would not shift. I rolled it off, added fluid, but still no shift. I get it hot, run it through the gears via the shifter, but no go. Check of gauge shows full.
Any ideas guys?