6R80 Overhaul Kit 2007-2008, new and ready to install. Fits the 6R80. Ships fast from the USA.
Plenty of owners of a 2007 or 2008 Ford Expedition, Lincoln Navigator, Explorer or Mountaineer search for a "6R80 overhaul kit" because every six-speed Ford of that era gets lumped under the 6R80 name. This listing carries reference KP37900J, the gasket and seal set used for the early Ford-built six-speeds. It is the kit to rebuild with when your 2007-2008 unit leaks from the pan or case, sits in neutral for a second before Drive or Reverse catches on a cold start, or flares between gears on a high-mileage unit whose seals have gone hard.
Strictly speaking, the transmission in a 2007-2008 truck is not a 6R80. Transmission Digest explains that Ford started building its own version of the ZF 6HP26 in 2006, launched it as the 6R60, followed it with the higher-torque 6R75, and only then released the 6R80, which arrived with the 2009 F-150 and later took over the Expedition and Navigator. So a 2007-2008 Explorer V8 or Sport Trac V8 carries a 6R60, and a 2007-2008 5.4L Expedition or Navigator carries a 6R75. The internal layout is shared across the family, which is why parts catalogs use the names loosely, but the seal set has to match the generation in your case, and that is the generation this kit is built for.
Six forward gears come from one simple planetary, one double planetary and five clutch packs, and every gear applies two packs at once. Fluid reaches the rotating clutch drums through sealing rings, and each piston holds apply pressure with a molded seal. On these pre-2011 units the D clutch stays applied for all of first gear, because the one-way clutch that GEARS Magazine describes was not added until the 2011 6R80. When seals harden, a pack fills late or bleeds off pressure under load, and the controller reads that as slip. This kit replaces the piston seals, sealing rings, O-rings and gaskets throughout the unit. Frictions, steels and a filter are not part of it.
On this family the solenoids, the speed sensors, the temperature sensor and the range sensor all live on a Mechatronic control unit bolted to the valve body. A failed sensor or a drifted solenoid can mimic a slipping clutch, so scan for codes and check the fluid level at operating temperature first. Software can mimic hardware too: Transmission Digest documents a harsh 2-1 downshift on 2007-2008 Navigators built on or before April 17, 2008 that needs a PCM reprogram and can survive an overhaul. Our 6R80 family problems guide and the Navigator problems guide cover those checks.
The listing is for 2007-2008 units. In practice that means the 6R60 in the V8 Explorer, Sport Trac and Mountaineer and the 6R75 in the 5.4L Expedition and Navigator. Read the tag on the case before you order. If your truck is a 2009 or later and truly has a 6R80, use our 2009-2014 6R80 overhaul kit instead; Transmission Digest points out that the 6R80 front pump drops the stator-support bushing the 6R60 and 6R75 use and has a larger bore, so the generations do not swap blindly. Compare every ring and seal against the one you pull out, and send us your year, model and VIN if anything looks off. Everything for the family is on the 6R60, 6R75 and 6R80 collection page.
| Fits | 6R80 2007-2008 |
| Part type | Overhaul Kit |
| Condition | New |
| Brand | OEM |
| Reference | KP37900J |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
A 2008 Expedition or Navigator with the 5.4L actually uses the 6R75, the predecessor of the 6R80. This KP37900J kit is built for that early generation, so it is the correct seal set. Confirm with the tag on the case.
No. The 2009-and-later F-150 uses the true 6R80, which has a different front pump and other updates. Order the 2009-2014 6R80 overhaul kit for those trucks.
No. It is the seal and gasket set: piston seals, sealing rings, O-rings and gaskets. If the clutch plates are burnt or worn to the grooves, buy frictions and steels separately or step up to a master kit.
Probably not. On 2007-2008 Navigators built on or before April 17, 2008 that complaint is a calibration issue fixed by a PCM reprogram and an adaptive relearn. Have that done first, and rebuild only if the unit also leaks or slips.
Yes. Clear the adaptive tables with a scan tool and drive the vehicle through repeated light-throttle upshifts and coast-down stops so the controller can relearn clutch fill times on the fresh seals.
