4R70W Master Rebuild Kit 1998-03, new and ready to install. Fits the 4R70W. Ships fast from the USA.
The 1998-2003 4R70W is the version most people are rebuilding today: the transmission behind millions of F-150s, Expeditions, Navigators, Mustangs, Crown Victorias, Grand Marquis and Town Cars from those years. When one of them starts slipping on the 2-3 shift, bangs into gear, or leaves the dipstick dark and burnt, this master rebuild kit gives you the frictions, steels, seals and gaskets to overhaul it in one job, sized for the 1998-to-2003 build rather than the earlier or later cases.
Inside the 4R70W, four clutch packs and two bands are applied by hydraulic pistons in sequence to give four forward gears and Reverse. Every apply depends on two things: friction plates that still have material on them, and seals that hold pressure behind each piston. After a couple hundred thousand miles, or less if the unit has been overheated towing, both give out together. Replacing the whole set at once is what a master kit is for, and it means you are not chasing a second leak a month after fixing the first.
This range straddles a change that matters on the bench. Transmission Digest reports that Ford removed the two-bolt stiffener plate under the 2-3 accumulator for 2001. On 2001-2003 units the separator plate can then flex and let forward clutch oil cross into the direct circuit, which burns the direct pack again after a rebuild unless the valve body area is corrected. A 1998-2000 unit still has the plate, so check that it is present and tight. Transmission Digest also lists a 2000-up first gear rattle fixed by Ford's intermediate clutch anti-rattle clip, YL3Z-7A609-AA, which is worth adding while the case is apart. Our F-150 shift problems guide and Expedition common problems guide explain how to separate a valve body or solenoid fault from worn clutches before you spend money on a teardown.
This kit is listed for 1998-2003 4R70W transmissions. That window starts with the 1998 switch to a molded internal lead frame harness, which ATSG describes as the change that set the electrical layout for the later units, and it ends before 2004, when ATRA documents a new ring gear and output speed sensor that do not interchange with earlier parts. If your unit is a 2004 or later, use the 2004 4R70W master kit instead. Pan bolt pattern and pump casting can also differ between applications, so match your casting or send your year, model, engine and VIN and we will confirm the kit. Browse the full 4R70W/4R75W parts collection for hard parts.
For a 2001-2003 unit with a worn valve body, the 2001-2008 4R70W valve body pairs well with this kit, and a chewed-up gearset is covered by the 1993-2002 planetary.
| Fits | 4R70W 1998-03 |
| Part type | Master Rebuild 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.
It is listed for 1998-2003. 1997 and earlier units use the older white case connector and earlier internals, so send us your VIN and we will point you to the right kit.
Transmission Digest traces it to the 2001 removal of the stiffener plate under the 2-3 accumulator, which lets forward clutch oil leak into the direct circuit. Correct that area during the rebuild.
Transmission Digest reports a 2000-up first gear rattle fixed with Ford's intermediate clutch anti-rattle clip YL3Z-7A609-AA. Install it during the rebuild.
No. ATRA documents that the ring gear and output speed sensor changed for 2004 with no interchange. Use our 2004 4R70W master kit.
Mercon V. Ford's 2003 Crown Victoria owner guide lists about 13.9 quarts dry; trucks and cooler sizes vary, so finish the level on the dipstick at operating temperature.
