Full overhaul kit for the Ford 4R70W, 4R75W and 4R75E four-speed: frictions, steels, seals, gaskets and thrust washers for 1998-2003 F-150 and Expedition.
If your 1998-2003 F-150, Expedition or Navigator flares between gears, slips into overdrive under load, or came back from a tow with dark, burned-smelling fluid, the 4R70W behind that 4.6L or 5.4L usually needs a full teardown rather than a fluid change. This master kit puts the clutch stack and the soft parts in one box: frictions, steels, the full gasket and seal set, rubber lip seals, sealing rings, thrust washers and the pan gasket. It is listed for the 4R70W along with the 4R75W and 4R75E, which share the same overhaul parts.
The 4R70W is Ford's four-speed rear-wheel-drive electronic overdrive automatic. Its forward clutch is fed from the pump at the front of the case, while the direct clutch is fed through the output shaft at the rear, so a leak at either end shows up as a different shift complaint. A flare on the 1-2 or 2-3 means a pack is not holding, and once a friction slips it glazes the steels next to it. That is why this kit replaces the steels with the frictions: glazed or heat-blued steels will burn a new friction within a few hundred miles. The thrust washers in the kit set the running clearance between the drums and the planetary parts, which is just as important as the clutches once the unit has been run hot.
Pull the pan first. Friction material and fine metal in the pan mean the clutches are done and a seal kit alone will not save the unit. If the pan is clean, scan for codes, check the fluid level hot and run a line pressure test, because a worn pressure regulator or a sticking solenoid can cause slip without any clutch damage. A soft 1-2 can also come from a broken 1-2 accumulator spring. Our 4R70W F-150 shift problems guide covers those checks in order, and the Expedition common problems guide lists what fails most in the heavier SUVs.
The listed fitment is broad: F-150, F-250, E-150, E-250 and E-350 from 1998-2003, Expedition and Navigator 1998-2003, Explorer and Mountaineer 1998-2001, Mustang 1998-2004, Thunderbird 1998-2002 and the Lincoln Mark VIII. Not every vehicle on that list used this transmission in every configuration. Heavy-duty F-250 Super Duty trucks and the larger E-series vans with the V10 or diesel used the 4R100, Explorers only used the 4R70W with the V8, and the 2002 Thunderbird used the 5R55N. Read the ID tag on your case and count the plates in each pack against the kit, or send us your year and VIN. The full family is on the 4R70W collection page.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Frictions, steels, the complete gasket and seal set, rubber lip seals, sealing rings, thrust washers and the pan gasket. Hard parts such as the pump, drums, valve body and planetary gears are separate.
Only if the truck has the 4R70W. F-250 Super Duty trucks used the 4R100. Check the ID tag on the transmission case, or send us your year and VIN.
Yes. The listing covers the 4R70W, 4R75W and 4R75E, which share these overhaul parts. Valve body calibrations differ, so reuse your own valve body or match it to your unit.
Steels that have run against a slipping friction are often glazed or heat-blued. A glazed steel will burn a new friction quickly, so they are replaced together.
Use MERCON V in these 1998-2004 units. Prime the pump, fill, start the engine, shift through the gears and set the final level hot on the dipstick after a road test.
Clear any stored codes after the rebuild and expect the computer to relearn shift feel over the first several drive cycles. Drive normally and recheck the fluid level hot after the first few days.
