Drivetrain Problems With 4r70w Auto Transmission

Discussion in 'SN95 4.6L Mustang Tech' started by LM2, Aug 11, 2013.

  1. Hello,
    I have a 1997 Ford Thunderbird 4.6L V8 with the standard 4-speed 4R70W automatic transmission. I just bought the car and it has a total of 51,800 miles on it. The day after I bought it I had the ATF filter and fluid changed. Big O Tires used Valvoline Maxlife ATF. My previous car was also a '97 TBird; they used the same ATF and it worked out fine.

    The ATF fluid has the correct level, color, and smell. On a level surface when I am on the road and I release the accelerator, the car slows by a bit too much, almost as though the brakes are slightly being applied. When I am coasting or at a full stop and I press the accelerator, there is a slight, split second pause, then the car accelerates. When I am stopped and in Drive, the engine runs slightly rough and the transmission makes a slight turning noise. In Park, the engine runs smoothly.

    My previous '97 TBird did not do this. Can someone tell me what the problem is? Is it a solenoid or a vacuum sensor?
  2. There is a Ford TSB that recommends for the transmission to be re-filled using fluid meeting the Mecron V spec (even though the original manual states Mecron 4). I have had torque converter slipping issues on two separate Fords and changing the fluid solved it.
  3. Yes, I will probably go to a Ford dealer and have them flush it. I think that's all I'll do. Also, I will add a fuel injector cleaner to the gas tank. Would you happen to know which is the best one. There are many available.