A/T - ATX Erratic Upshifts Sometimes No Upshift
Technical Bulletin # 86-54Date: October 1986
Subject: FORD ATX
SYMPTOM: Erratic upshifts, sometimes no upshift. Transmission may make one or two upshifts while cold, and then stop working.
POSSIBLE SOLUTION:
Close attention should be given to the small filter in the governor circuit. The filter (see illustration) may become partially or completely plugged.
Note:
If only partially blocked, shifting may be erratic, or the transmission may only shift when cold. If the filter is completely plugged, no upshift will occur.