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Torque Converter Drainback Test

WARNING: This page is about a different car, the 2004 Ford Econoline, 2004 Ford E450 Super Duty, and 2004 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
  1. Drive the vehicle for 30-60 minutes to attain normal operating temperature.
  2. Check the transmission fluid level. Add fluid only if required.
  3. Drive the vehicle through 8 to 10 cycles of 1/2 throttle, 1 -2 upshifts to elevate the transmission temperature. Then proceed as follows:
    • Park the vehicle on level ground.
    • Allow the vehicle to sit for 30-60 minutes.
    • Check and note the fluid level on the fluid level indicator with the engine off, in PARK. The following example shows the fluid level after 45 minutes.
    Fig 1: Torque Converter Drainback Test
    G02761956Courtesy of FORD MOTOR CO.
  4. Allow the vehicle to sit for a minimum of 24 hours. Check and note the fluid level.
  5. If the fluid has risen 25.4 mm (1 in) or more above the level in the first check, excessive converter drainback has occurred.
  6. If excessive drainback has occurred:
    • Stuck open check ball in rear cooler line case fitting.
    • No check ball in rear cooler line case fitting.
    • Incorrect case cooler line case fitting (without check ball) installed.
  7. Repair as required and recheck.
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