I've seen this same problem posted elsewhere but have seen no answers. My problem: transmission works fine till I sustain a constant 45-50 mph then the od/off light starts blinking, and it is still in overdrive. The tranny then down shifts hard into first gear when stopping and then shifts hard from first to second when accelerating (from stop). anybody have any ideas as to what is the problem. Would appreciate any help.

 

You will never get an answer if we don't know what you drive. Transmissions also vary by engine.

 

I guess that might help huh!? Its a 99 Ranger 3.0 L automatic. Now maybe I can get some help I hope.

 

I would take it to autozone and have them pull the codes, see what they say. Usually when the o/d light blinks it is a sensor or the selonoid pack.

 

FORD:
1995-2001 EXPLORER
1995-2002 RANGER
1996-1997 AEROSTAR
1999-2002 EXPLORER SPORT
2001-2002 EXPLORER SPORT TRAC
Article 02-8-2 is being republished in its entirety to update the DTC codes, build dates and to update the Service Procedure.
ISSUE
Some vehicles built prior to 12/1/2001 may exhibit the following shift and engagement conditions:
Low line pressure readings while in DRIVE at WOT
No 2nd gear
No 3rd gear
No engine braking in Manual 1st
Slipping shifts and/or delayed engagements
DTCs P0732, P0733 or P1762 may be present
This may be caused by improper pressures controlled by the Transmission Main Control assembly.
ACTION
If the conditions described are verified, the Main Control may need to be updated to the latest level or completely replaced. Refer to the following Service Procedure for details.
SERVICE PROCEDURE
Verify that one or more of the following conditions exist:
Low line pressure while in Drive at WOT
Slipping/delayed shifts
Slipping/delayed engagements
No 2nd and/or No 3rd gear
No engine braking in Manual 1st
OD Band failed OFF
DTC P0732, P0733 or P1762 set

There is also a problem with the bracket that holds the EPC solenoid cracking. There is an improved EPC solenoid and numerous problems with the valve body gasket.