Gearbox Mitsubishi F4A23

The 4-speed automatic transmission Mitsubishi F4A23 or under the old name KM177 was produced from 1991 to 1998 and was installed on such models as the Eclipse, Galant and Space Wagon. This transmission was intended for front-wheel drive cars with an engine up to 2.4 liters and 200 Nm.

This series includes: F4A21, F4A22, F4A23, F4A33, F4A41, F4A42, F4A51, W4A32, F5A51.


Production years 1991 – 1998
Type automatic transmission
Number of gears 4
Type of drive front
Engine volume, l up to 2.4
Torque output, Nm up to 200
Recommended oil Mitsubishi ATF SP III
Oil capacity, liter 6.3
Replacing the oil every 80,000 km
Replacing the filter every 160,000 km
Gearbox lifespan, km ~350 000

Gear ratios Mitsubishi F4A23

Using the example of a Mitsubishi Space Wagon 1995 with a 2.4 liter engine:

Main 3.900
1st 2.551
2nd 1.488
3rd 1.000
4th 0.685
Reverse 2.176

The transmission was installed on:

  • Mitsubishi Eclipse 2 (D3) in 1994 – 1999;
  • Mitsubishi Galant 7 (E5) in 1992 – 1998;
  • Mitsubishi Space Wagon 2 (UF) in 1991 – 1998.

Disadvantages of the Mitsubishi F4A23 gearbox

  • This automatic transmission does not have any design weaknesses and all the problems are purely age-related.
  • The automatic transmission is destroyed by a drop in oil pressure due to wear of the bushings and leaks in the oil seals.
  • Due to weak pressure, the service life of the clutch packs, and especially C1 and C2, decreases.
  • The freewheel, brake band or solenoid wiring are often replaced.
  • Sometimes there is destruction of the differential and planetary gear bearings.

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