Gearbox Mitsubishi F4A21

The 4-speed automatic transmission Mitsubishi F4A21 or under the old name KM176 was produced in Japan from 1987 to 2001 and was installed on models such as Mirage, Lancer and Colt. Based on this transmission, Hyundai automatic transmissions were created under the designations A4AF1, A4AF2 and A4AF3.

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


Production years 1987 – 2001
Type automatic transmission
Number of gears 4
Type of drive front
Engine volume, l up to 1.8
Torque output, Nm up to 150
Recommended oil Mitsubishi ATF SP III
Oil capacity, liter 6.1
Replacing the oil every 80,000 km
Replacing the filter every 160,000 km
Gearbox lifespan, km ~320 000

Gear ratios Mitsubishi F4A21

Using the example of a Mitsubishi Colt 1993 with a 1.5 liter engine:

Main 4.062
1st 2.846
2nd 1.581
3rd 1.000
4th 0.685
Reverse 2.176

The transmission was installed on:

  • Hyundai Lantra 1 (J1) in 1990 – 1995;
  • Mitsubishi Colt 3 (C5) in 1987 – 1991; Colt 4 (CA) in 1991 – 1996;
  • Mitsubishi Lancer 6 (C6) in 1988 – 1991; Lancer 7 (CB) in 1991 – 2001.

Disadvantages of the Mitsubishi F4A21 gearbox

  • This automatic transmission has no weak points in its design, all its problems are purely age-related.
  • The main thing is to monitor the oil pressure, since the bushings move relatively little here.
  • Lubricant leaks often occur, especially between the housing and the torque converter​​​​​​​.
  • Due to a drop in oil pressure, clutch packs C1 or C2 wear out quickly.
  • By 200,000 km, the differential bearings and freewheel are often replaced.

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