Check you vehicle prodution date if it's before 9/23/2004 it could be the pressure control solenoid needs to be replaced. Here's part of the tech bulliten sent to the Ford dealers from Ford:
Reference Number(s): 05-15-3, Date of Issue: August 8, 2005 Superceded Bulletin(s): 05-6-11, Date of Issue: April 4, 2005 Related Ref Number(s): 05-15-3, 05-6-11 ARTICLE BEGINNING DESCRIPTION NO 3RD GEAR, DTC P0733 (3RD GEAR INCORRECT RATIO) AND FLASHING TCIL - VEHICLES BUILT PRIOR TO 9/23/2004 ISSUE Some 2004-2005 Ranger and Explorer Sport Trac vehicles built prior to 09/23/2004 may exhibit symptoms of no 3rd gear along with a diagnostic trouble code (DTC) P0733 (3rd Gear Ratio Incorrect), and a flashing transmission control indicator lamp (TCIL). This may be due to improper pressure control. In addition, other shift concerns and transmission DTCs may be present. ACTION It may be necessary to replace the electronic pressure control solenoid (EPC). Refer to the following Service Procedure. FORD: 2004-2005 Explorer Sport Trac, Ranger NOTE: This article supersedes TSB 05-6-11 to update the Service Procedure.
Check your email for the complete bulliten.
Monday, December 28th, 2009 AT 2:45 PM