Overhauls the Ford 4F27E and Mazda FN4A-EL 4-speed automatic with frictions, steels, filter, brake band, gaskets and seals for Focus, Mazda 3, 5 and 6.
A Ford Focus, Escape or Transit Connect, or a Mazda3, Mazda5, Mazda6, Protege or Tribute with the four-speed automatic, that slips on the 2-3 shift, bangs into gear or stops pulling altogether usually has worn clutches and hardened seals inside, not broken hard parts. Ford calls this transaxle the 4F27E and Mazda calls it the FN4A-EL (FNR5 on later Mazdas). This master rebuild kit carries the frictions and steel plates, the overhaul gasket and seal set, lip seals and metal-clad seals, sealing rings, a new brake band and a new filter, so a complete teardown goes back together with fresh wear parts everywhere they matter. The listing cross-references service kit numbers K71900KP, K71900KPX, DP2352, DP2483 and 46500F.
The 4F27E gets its four ratios from clutch packs and a 2-4 band applied by hydraulic pressure that the valve body routes on command from the shift solenoids. Every apply depends on two things this kit replaces: friction plates with enough material left to hold torque, and seals that keep apply pressure where it belongs. When frictions glaze or seals harden, apply pressure leaks off, the clutch takes longer to lock and the engine flares through the shift. The new band and filter round out the job, because a band worn thin will not hold 2nd and 4th under load and an old filter just recirculates the debris from the failure.
Not every slip in this unit is a clutch. The 4F27E also has a well known valve body that wears its bores and cross-leaks at the separator plate, and that alone can give wrong-gear starts or no 2nd. Check fluid level and condition, pull codes, and compare commanded gear to actual ratio. Use our slipping diagnosis guide and gear ratio code guide to sort it out. Clean fluid with a shift complaint points to the valve body or solenoid block; burnt fluid and debris point to this overhaul.
The listing names the Ford Focus, EcoSport and Transit Connect and the Mazda 2, 3, 5, 6, Protege, Tribute and CX-7. Be careful: several of those nameplates were also built with other automatics, for example the North American 2012 and later Focus uses a dual-clutch unit, not the 4F27E. Confirm the transmission tag on the case reads 4F27E, FN4A-EL or FNR5 before ordering, and match your old kit box number to the list above, or send us your year and VIN and we will check it. The full range of parts for this transmission is on the 4F27E parts page.
| Transmission | |
| Drive | |
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| Replaces OE | |
| Fits |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
They are the same four-speed front-wheel-drive transaxle family under Ford and Mazda names. Ford uses 4F27E, Mazda uses FN4A-EL and later FNR5. Read the tag on the case to confirm which you have before ordering.
No. It covers the wearing parts: frictions, steels, gasket and seal set, sealing rings, band and filter. Pistons, drums and the pump are reused if they pass inspection. If your pistons are cracked or hardened, choose a kit that includes a piston pack.
Only if the cause is a worn band, worn clutches or leaking seals. No 2nd is also a classic valve body bore wear and separator plate leak fault in this unit, so diagnose fluid condition and ratio data first, and repair the valve body during any overhaul.
No. North American Focus models from 2012 on use a dual-clutch automatic, not the 4F27E. This kit is for Focus models built with the 4F27E four-speed. Check your transmission tag or send us your VIN.
Ford 4F27E applications use Mercon V. Mazda FN4A-EL and FNR5 units list a Mazda ATF specification in the owner's manual. Use the fluid your vehicle specifies and set the level hot on level ground.
