Master rebuild kit with filter for the Ford 4F27E / Mazda FN4A-EL four-speed in 2000-2008 Focus, Mazda6 and Protege. Replaces K71900KP.
If your Ford Focus, Mazda6 or Mazda Protege automatic slips between gears, flares on the 1-2 shift, or sits for a second before it engages Drive or Reverse, the four-speed under the hood is probably the 4F27E (Mazda calls the same unit the FN4A-EL). This master rebuild kit with filter is built for the full overhaul of that transaxle. It replaces the K71900KP and K71900KPX master kit numbers and carries the seals, gaskets, friction plates, steel plates and a new filter, so every clutch pack and every circuit seal gets renewed in one teardown instead of one leak or one slip at a time.
The 4F27E is a compact four-speed front-drive transaxle that shifts with clutch packs plus a 2-4 band, all applied by fluid pressure that the solenoid-controlled valve body routes through sealing rings and lip seals. When those seals harden and the frictions glaze, apply pressure bleeds off before it can lock a clutch, and the transmission computer sees the engine and output speeds stop matching. A master kit attacks that at the source: fresh frictions and steels restore the holding capacity of each pack, and new seals and gaskets put the hydraulic circuits back to full pressure. The included filter means the new plates are not fed debris from the old pickup.
Not every 4F27E that shifts badly needs a rebuild. TransGo lists wrong-gear starts, no 2nd, skipped 2nd and kickdown neutrals among faults it corrects with valve body repairs alone, so a worn bore can mimic burned clutches. Check fluid level and condition, read stored codes, and watch commanded gear against actual ratio on a scan tool; our guide to gear ratio codes P0730-P0734 walks through that test, and the transmission slipping diagnosis guide covers pressure checks. If the pan is full of friction material and the slip is mechanical, a master kit is the right buy. If the fluid is clean and the fault comes and goes, test the 4F27E solenoid block first.
The listing names 2000-2008 Ford Focus 2.0L, 2003-2007 Focus 2.3L, 2003-2006 Mazda6 2.3L and 3.0L, and 1999-2003 Mazda Protege 1.6L and 2.0L. Be careful with the Mazda6 V6: the 4F27E is rated for engines up to about 2.3 liters, so read the transmission ID tag on your car before ordering, and if it does not say 4F27E or FN4A-EL this kit is not the right one. The same applies to any Ford or Mazda model not on the list. If you are unsure, send us your year and VIN and we will check it, or browse every part for this unit on the 4F27E collection page.
Doing the clutches, seals, filter and valve body together is what keeps a rebuilt 4F27E from coming back with the same flare a few thousand miles later.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Only if your transmission tag reads 4F27E or FN4A-EL. The listing names the Mazda6 3.0L, but many V6 cars use a different automatic. Check the tag or send us your VIN before ordering.
It replaces the K71900KP and K71900KPX master rebuild kit numbers for the Ford 4F27E and Mazda FN4A-EL.
Yes. This version includes a new filter along with the seals, gaskets, friction plates and steel plates.
Mercon V. Total capacity from dry is about 7 liters, so set the final level hot on a level surface per the factory check procedure.
Sometimes. P0741 on this unit is often caused by leakage at the pump stator bushing that gets worse when the fluid is hot, so inspect the bushing and pump during the overhaul rather than relying on new seals alone.
No. Valve body bores wear on the 4F27E and need a separate repair kit or a remanufactured valve body.
