6R100 Overhaul Kit, new and ready to install. Fits the 6R100. Ships fast from the USA.
If your gas-engine F-250, F-350 or larger Super Duty with the 6R100 six-speed is leaking from the pump or case, engages slowly into Drive after sitting, or has lost line pressure after years of towing, the rubber inside the transmission is usually where the problem starts. This is a new TransTec overhaul kit labeled for the 6R80 and 6R100 from mid-2014 on, packaged in the US under kit number 0049389601. It is the reseal half of a rebuild: the gaskets, lip seals, sealing rings and O-rings that let every clutch circuit hold the pressure the valve body sends it.
The 6R100 is the heavy-duty member of Ford's 6R family, sharing its basic six-speed rear-drive layout with the 6R60, 6R75 and 6R80. Ford's fluid chart places it behind the 6.2L gas V8 in the F-250 through F-550 Super Duty and the 6.8L V10 in 2017-2019 trucks. Every shift in this unit is a clutch-to-clutch handoff timed by solenoids, so the TCM assumes each piston fills and applies at a predictable rate. Hardened piston seals, worn sealing rings on the rotating shafts and a tired pump seal all bleed off apply pressure, which stretches fill time and makes the computer push its adaptive tables until a shift flares or the truck sets a ratio code. An overhaul kit replaces that sealing layer so the hydraulics behave like new again.
Two details from the package matter. The kit is marked mid-2014-on, which tells you TransTec split the 6R80/6R100 seal sets at that point in production. The listing also states it is supplied without pistons, so bonded pistons are not in the box. Frictions, steels and a filter are not included either.
Clean the case, run the truck and find where the fluid actually leaves. A leak at the front can be the pump seal, a weep at the cooler lines can look like a pan leak, and a valve body bore problem can mimic a sealing failure. Check fluid level hot, read codes, and compare commanded gear to actual ratio on a scan tool. Our 6R80 fluid leak common spots guide covers where this family weeps, and the 6R80 delayed engagement fix walks through separating a pressure leak from a pump or valve body fault. If the pan is full of lining material, plan a full rebuild with frictions and steels, not just this kit.
The package label reads 6R80 6R100 M/14-on, meaning mid-2014 and later production. That covers the 6R100 in the 6.2L and 6.8L Super Duty trucks of that era. Because the cutover happened partway through the 2014 model year, a 2014 truck can land on either side of the change. Read the build date and transmission code on the case tag, and if you are unsure, send us the year and VIN before ordering. If your unit is earlier, check the 6R100 overhaul kit for 2015-2023 and the rest of the 6R100 parts collection, and use our 6R80 vs 6R140 differences guide if you need to confirm which six-speed is under the truck.
| Fits | 6R100 |
| Part type | Overhaul Kit |
| 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 a TransTec gasket and seal set: gaskets, lip seals, sealing rings and O-rings. The listing states it is supplied without pistons, and frictions, steels and a filter are bought separately.
Possibly. The kit is labeled for mid-2014 and later 6R80 and 6R100 units, so a 2014 truck can fall on either side of the change. Check the build date on the door tag and the transmission tag, or send us your VIN to confirm.
Ford's fluid chart lists the 6R100 in the F-250 through F-550 Super Duty with the 6.2L gas V8, and with the 6.8L V10 in 2017-2019 trucks. Diesel Super Duty trucks use the 6R140 and need a different kit.
Ford specifies Mercon LV for the 6R100. Use it to pre-soak the seals and to refill, and set the level hot with the engine running as the service procedure describes.
Yes. New seals change how fast each clutch fills, so clear the adaptive tables with a scan tool and drive through all six gears with light and moderate throttle so the TCM can rebuild its shift timing.
