6F50 Sun Shell, used and ready to install. Fits the 6F50. Ships fast from the USA.
This is a used, cleaned and inspected sun shell for the Ford 6F50 and 6F55 six-speed front-drive transaxle, the unit behind the 3.5L and 3.7L V6 in the Edge, Explorer, Flex, Taurus, Taurus X and Lincoln MKX, MKS and MKT. It is the output-side shell with a 41-tooth sun gear, a 36-tooth hub and 16 triangle-shaped windows around the drum face. Buyers usually find it after a teardown shows stripped hub splines, a chewed sun gear or a cracked shell, or after a whine that rises with road speed ended with metal in the pan. The same shell also serves the GM 6T70 and 6T75, since the two families share their gear train.
The 6F50 builds six forward ratios by locking and driving different members of its planetary gearsets with five clutches: Forward, Intermediate, Direct (3-5-R), Overdrive (4-5-6) and Low/Reverse, plus a one-way clutch for first gear. The sun shell is the sheet-steel and cast drum that ties a sun gear to the rest of the gear train, so it carries torque in every gear the vehicle drives in. The 41 sun gear teeth mesh with the planet pinions, and the 36-tooth hub transmits torque through its splines. When those splines wear or strip, the gearset loses its connection and the transmission can lose one or more ratios, or stop moving entirely, even though the clutches are healthy.
Check the fluid level and pull the pan. Bright steel debris points to the gear train; black, fibrous debris points to clutch wear. Read codes and watch commanded versus actual gear on a scan tool: if every clutch-related gear misbehaves at once, or the vehicle will not move while the scanner shows a gear commanded, the mechanical connection is suspect. The full diagnostic flow for this family, including the 3-5-R wave plate and valve body faults that cause most complaints, is in our Ford 6F35/6F50 transmission problems guide. Only a teardown will show the shell itself, so most buyers order this part once the unit is already apart.
This shell is listed for the 6F50, 6F55, 6T70 and 6T75 from 2007 on. On the Ford side the 6F50 arrived in 2007 and the 6F55 in 2009. Ford door tags code the unit at position 8: J is a 6F50, C is a 6F55 and 6 is the smaller 6F35, which uses a different gear train and is not a match. Because hard parts were revised across model years, lay your old shell beside this one before you install it: count 41 teeth on the sun gear and 36 on the hub, and match the 16 triangle windows. If you are unsure, send us the year, model, engine and a photo of your original part. All of our 6F35 and 6F50 parts are on the 6F35/6F50 transmission page.
| Fits | 6F50 |
| Part type | Sun Shell |
| Condition | Used |
| 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. The 6F35 in the Escape, Fusion and four-cylinder applications is a smaller transaxle with its own gear train. This shell is for the 6F50 and 6F55 (and the GM 6T70 and 6T75). Check position 8 of the door tag: J or C is a match, 6 is a 6F35.
Compare it to your old part: the sun gear has 41 teeth, the hub has 36 teeth and the drum face has 16 triangle-shaped windows. If all three match, you have the right shell. If not, send us your year, model, engine and a photo.
The thrust washers and bearings on each side, any worn bushings, the filter and all seals and gaskets. Inspect the mating planetary carrier for pinion end play and roughness, and flush or replace the cooler if steel debris went through the unit.
Ford's current fluid chart lists Mercon LV for the 6F50 and 6F55. The earliest 2007-2008 units left the factory with Mercon V, so follow the specification on your dipstick or in your owner's manual.
No. It is a used original-equipment shell that has been removed from a transmission, cleaned and inspected for wear before sale. It is covered by our 1-year warranty.
Yes. Any repair that opens the unit should be followed by clearing codes and running the transmission adaptive relearn with a scan tool so the module relearns clutch fill and shift timing.
