(Mechanical Diode Style)
Update Reverse input drum changed from 7-element roller to 14- element, then to mechanical diode.
Date - Late 1997
Reason Reduced failure of the intermediate sprag.
Note The AODE came equipped with the 7- roller element drum. The 4R70W came with the 14- roller element drum. The 14-element drum is suppose to be the stronger of the two because it has twice as many rollers in the element. However, the 14- element sprag still fails in police cars, fleet vehicles, taxis and limousines. In order to reduce sprag failure Ford has released a new design reverse input drum that uses a mechanical diode.
Parts Changed
· Reverse input drum
· Inner race
· Outer race
· Sprag element
· Retainer and snap ring
Interchange Will fit all past models.
Part Numbers
Mechanical Diode Reverse Input Drum (Sprag not included) # F8AZ-7D044-AA
Mechanical Diode Sprag Package # F8AZ-7A089-AA