4R70W Planetary 1994, new and ready to install. Fits the 4R70W. Ships fast from the USA.
This listing is the ring gear from the 4R70W planetary, not a complete planetary set. It is a new old stock Ford output shaft ring gear, part number F4AZ-7A153-A, still unused. The listing covers the 1994-and-later AOD and 4R70W. If you are rebuilding a 1994 to 2003 F-150, Crown Victoria, Grand Marquis, Town Car or Mark VIII transmission and the old ring gear has chipped teeth, worn splines or a damaged sensor area, this is a factory replacement rather than a used core.
The 4R70W runs a single compound planetary set: a forward sun gear, a reverse sun gear, short and long pinions in one carrier, and one ring gear around the outside. The ring gear is the output member. Its internal teeth mesh with the long pinions and it drives the output shaft, so every forward gear and Reverse leaves the transmission through it. On early units the ring gear also gives the output speed sensor its signal through six holes machined around it. That signal is what the computer uses for vehicle speed and shift timing.
Rear axle bearings and a worn differential can also whine with road speed, so rule them out first. Panther cars even had a 2003 recall for overloaded rear wheel bearings and axle shafts. A bad output speed sensor or wiring gives the same erratic shifting as a damaged sensor area, which is cheaper to fix. Read codes, check the sensor, then inspect the pan. The F-150 common problems guide and the Crown Victoria common problems guide walk through these checks.
The part is listed for 1994-up AOD and 4R70W. For the 4R70W the practical limit is 2003. ATRA's interchange notes say Ford redesigned the output speed sensor for 2004. The new sensor reads 24 lugs on the park gear, while the early sensor reads the six holes in the ring gear, and the two ring gears do not interchange. An early ring gear in a 2004-up unit cuts the sensor signal by about 75 percent and the transmission will not shift out of first. Compare the old part number, the sensor holes and the spline count, or send us your year and VIN. More parts are in the 4R70W collection.
| Fits | 4R70W 1994 |
| Part type | Planetary |
| Condition | New |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. It is only the output shaft ring gear, Ford F4AZ-7A153-A. The carrier, pinions and sun gears are separate parts.
No. Ford changed the ring gear and output speed sensor for 2004, and ATRA says they do not interchange. This gear is for 1994-2003 4R70W units.
It is an original Ford part made years ago and never installed. It is new, not rebuilt or used.
Yes. On pre-2004 units the output speed sensor reads holes in the ring gear. Damage there can cause erratic speedometer readings, wrong shift points and speed sensor codes.
MERCON V. Ford recommends MERCON V where MERCON V or the older MERCON is specified.
