6R140 Sprag Clutch, used and ready to install. Fits the 6R140. Ships fast from the USA.
A 6R140 Super Duty that pulls away in manual first but sits in neutral or slips when you launch in Drive is the classic sign of a failed one-way clutch, and that is what most people mean when they search for a 6R140 sprag. In this transmission the sprag is not a loose part. It is built into the rear planet, so this listing is the complete used Ford assembly: the six-pinion rear planet carrier with its one-way clutch and the low/reverse clutch hub, reference 236580A. It is the economical way to replace a worn or damaged sprag in an F-250, F-350, F-450 or F-550 without buying the individual pieces.
The 6R140 uses a simple front planetary feeding a Ravigneaux rear planet, and the rear carrier has to be held still for first gear and reverse. Two parts can hold it: the low/reverse clutch and the one-way clutch. According to Sonnax, the low/reverse clutch is applied in Park, Neutral, manual first and Reverse. That leaves the one-way clutch, a mechanical diode design, to hold the carrier for a normal launch in Drive. It locks in one direction and freewheels in the other, so the 1-2 upshift happens without any clutch having to release. Transmission Digest notes the 6R140 had this one-way clutch from the start, unlike early 6R80 units.
The quick road test is the manual first comparison above: if manual first drives and Drive first does not, the one-way clutch is the prime suspect because manual first adds the low/reverse clutch. A delayed engagement that affects Reverse too points instead to fluid level, line pressure or the low/reverse circuit. Our 6R140 delayed engagement guide covers those checks, and the 6R140 rebuilder's guide explains what to inspect once the unit is apart.
This is a six-pinion carrier, the standard-duty version. Transmission Digest reports that commercial-duty 6R140 units use an eight-pinion planet, so count the pinions on your old carrier first. There is also a July 2016 change: early six-pinion planets carry a bolted support plate at the front that acts as a bearing race on the center support, while the updated planet drops the plate and has no bolt holes for it, and the diode was revised at the same time. Match your old planet's design, and check that it suits the center support in your case. This is a used OEM part, so compare it side by side with yours before installing, or send us your year and VIN. You can see all of our 6R140 transmission parts here.
| Fits | 6R140 |
| Part type | Sprag Clutch |
| 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. It is a used Ford 6R140 rear planet assembly with the one-way clutch (sprag) and the low/reverse clutch hub. In the 6R140 the sprag is part of the rear planet.
The usual sign is no drive or slip when launching in Drive while manual first still pulls normally, because manual first adds the low/reverse clutch to hold the carrier.
This is a six-pinion standard-duty planet. Commercial-duty 6R140 units use an eight-pinion planet, so count the pinions on your old carrier before ordering.
Yes. Early planets have a front support plate that rides on a bearing on the center support, and the July 2016 update removed it. Match your original design and center support.
Mercon LV. Check the level at operating temperature after the rebuild and reset adaptive values before road testing.
