Expands and resizes the solid Teflon sealing rings on a Ford 10R80 input shaft so they seat in the groove and slide into the drum without cutting.
Anyone overhauling a Ford 10-speed from a late-model F-150, Mustang, Expedition, Navigator or Ranger hits the same step sooner or later: the input shaft has solid Teflon sealing rings, and they will not go on like the scarf-cut rings of older Ford automatics. This five-piece set handles both ring sizes on the 10R80 input shaft. The two yellow tapered expanders open each ring enough to travel over the shaft, and the black compression sleeves and short collar squeeze it back down once it is in its groove. At 5.8 oz it lives in a drawer and pays for itself the first time it saves a ring.
The input shaft in this transmission does double duty. Besides carrying engine torque, it routes oil for the converter clutch and for the C, D and F clutches from the stator support back toward the CDF cylinder, crossing from the shaft into the sun gear shaft through a row of sealing rings. A solid ring has no joint, so the only way to fit one is to stretch it. Stretched, it no longer fits the bore it has to seal against. The expander controls how far the ring opens, which avoids overstretching, and the compression sleeve sets the outside diameter back where it needs to be so it slips into the mating bore cleanly.
You need this set any time the input shaft comes out and its rings are replaced: a full overhaul, a CDF cylinder replacement, or a repair after a blown internal cup plug. Transmission Digest describes how a missing cup plug in the shaft burns the C, D or F clutch and overheats the converter, and how air escaping from the shaft tip during an air check gives it away, so check that before ordering rings. Our 10R80 common problems guide covers the failures that usually start a rebuild, and the 10R80 Mustang shift problems guide helps pin down which circuit is leaking.
Made for the large and small diameter solid rings on the Ford 10R80 input shaft, used in the 2017-up F-150, 2018-up Mustang, Expedition and Navigator, 2019-up Ranger and other 10R80 vehicles. It is not for the Bronco, which uses the 10R60. The CDF drum ring positions use a different size, so pair this kit with the 10R80 CDF drum sealing ring resizer set if you are doing both. Rings and transmission parts are not included. More rebuild parts are in the 10R80 collection.
| Transmission | Ford 10R80 10-speed automatic |
| Used on | Input shaft solid Teflon sealing rings, large and small diameter |
| Pieces | 5 |
| Material | High-strength plastic |
| Included | Expanders and compression resizer sleeves (rings not included) |
| Weight | 5.8 oz |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Yes. The set includes expanders and compression sleeves for the large and small diameter solid Teflon rings on the 10R80 input shaft.
No. It is the tool only. New rings come in a 10R80 overhaul or rebuild kit.
No. The CDF drum rings are a different diameter. Use the dedicated CDF drum resizer set for those positions.
The 2017-up F-150, 2018-up Mustang, Expedition and Navigator, 2019-up Ranger and other 10R80 applications. The Bronco uses the 10R60 and is not covered.
Yes. After filling with MERCON ULV and setting the level hot, clear adaptive memory and complete the adaptive learning drive cycle so the TCM learns the new clutches.
