Disconnect your battery OVERNIGHT.
The PCM (computer) needs at least 20 - 30 minutes without the battery, to clear its shifting pattern buffer.
The ATX is shifted electronically and it is controlled by the PCM.

Try this and then flush it out at a shop that has the proper TOOLS to do the flush.
The CD4E Automatic Transaxle does NOT have a drain plug
and it does not have a pan on the bottom.

Pete...

98.5 SE Sport Duratec ATX (P66L)
Black Clearcoat on Greystone
DOB 11/21/1997
DOP 12/25/1997
PIAA 510 Super White Driving Lights
SVT CAT-BACK EXHAUST (No Resonator)
DiabloSport Chip (LPQ4) - Engineered To Raise Hell
Too many other mods to list...
Sounds sweet, runs quick...
Crazy Horse Dyno @ 121.4 WHP/129.6 TQ