Ford 4F27E transmission

The 4F27E is an electronically controlled 4-speed automatic transmission, used by Ford and Mazda. Ford's name for this transmission is 4F27E, Mazda's name for this transmission is FN4A-EL. This dipstick for this transmission says "M V" on the dipstick handle in Mazda vehicles.

ManufacturerFord Motor Company
Mazda Motor Company
Also calledFN4A-EL
Body and chassis
Class4-speed transverse automatic transaxle
SuccessorFord FNR5/Mazda FS5A-EL

The 4F27E is a strengthened 4-speed F-4EAT automatic and only some of the internals were updated. It now has a four-element torque converter that includes a torque converter clutch and geartrain with two planetary gearsets, a transfer-shaft gear final drive, and a larger differential. The hydraulic control system of the 4F27E transaxle has six electronically controlled solenoids for shift feel (through line pressure control), shift scheduling (through shift valve position control) and TCC (torque converter clutch) apply, controlled by pulse-width modulation (PWM). The Mazda FS5A-EL (Ford FNR5) is the 5-speed successor to this transmission. It uses many of the same parts.

In Mazda applications, this transmission uses Mazda M5 fluid (Mazda part number: 0000-77-112E-01), which is NOT Mercon V or Mercon LV according to Mazda Technical Service Bulletin 0500116. This fluid is made by Idemitsu Kosan (according to the label on the back of the Mazda bottle). Idemitsu sells the equivalent Type-M fluid in the aftermarket. The equivalent Ford fluid is FNR5 (Ford part number: XT-9-QMM5).

On the other hand, concerning Ford application, Ford cars used Mercon V (Ford part number: XT-5-QMC) until 2007 MY. After 2007 Ford made some hardware and calibration modifications so that since 2008 MY it is required to use Mercon LV oil (Ford part number: XT-10-QLVC). Later Ford authorized back servicing transmissions from 2000 to 2007 with Mercon LV.

Differences between Ford Mercon ATF and Mazda type M5 ATF:

  • Mazda type M5 ATF is not the same fluid as Ford Mercon V or Ford Mercon LV.
  • Mazda type M5 ATF has a greater viscosity than Ford Mercon V and Ford Mercon LV in low temperatures.
  • Mazda type M5 ATF has a greater anti-judder specification than Ford Mercon V and Ford Mercon LV.

Transmission dry fill capacity: 6.7 Liters / 7 Quarts.

Gear ratios:

1 2 3 4 R
2.81:1 1.50:1 1.00:1 0.73:1 2.65:1

Transmission name description:

4 F 27 E
4 speed Front wheel drive Maximum input torque after torque converter:

270 Lb-ft (365 N-m)

fully Electronic control



  • "Positive Shifting". Mustangs and Fast Fords. Retrieved February 22, 2006.
  • "FNR5 Automatic Transmission Fluid". Retrieved October 11, 2016.
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  • "Automatic Transmission Fluid ATF - 2000-2016 Mazda".

See alsoEdit