Did a search on "harsh downshift" and here's one of the threads:

"The complaint: , quoting
"Harsh 3-1 or 2-1 dowhshift when driving slowly at 12-15mph, and abrupt 80% + throttle application."

The Remedy:
"According to ALLDATA is to install a modified Plate-type check valve with throttle (13 in the illustration) , P/N 124 270 02 89, install into shift valve housing of valve body. (the modified/improved plate valve is red in color.)""

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Steve
'93 400E