One problem related to differential unit has been reported for the 2004 Ford Explorer Sport Trac. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Ford Explorer Sport Trac based on all problems reported for the 2004 Explorer Sport Trac.
Grinding feel from the rear end resulted in a replaced and updated complete rear end from Ford. Still have very loud whining noise when automatic transmission is in first gear. Dealer says this is normal and I have to get use to it. Also have noticable thumping from transmission and drive shaft area when between 30 and 50 mph. Dealer has verified noise and is considering a new drive shaft. Car is new and has less than 3000 miles.