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A little more about the 6-speed from Korea

Thursday, January 21, 2016 - 09:00
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Hyundai and Kia manufacturers use a front-wheel drive 6-speed transmission in many of their vehicles. Back in May 2014, a short Powertrain Pro newsletter was sent out about this transmission. This article will briefly cover what was written then and continue with a couple of issues that could be encountered.

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The name for this transmission is determined by the size engine it’s paired to. From as small as a 1.2L engine to as big as a 4.0L, the names begin with A6GF1, increasing to A6MF1 and 2, and then to A6LF1, 2 and 3. Similarly, as engine size increases, so does the size of the transmission. This of course is due to the necessary increase in toque capacity. The general application of these transmissions is as follows and is not limited to:

  • The A6GF1 is fitted with a 1.2L, 1.6L, 1.8L or a 2.0L engine. Most are behind the 1.6L.
  • The A6MF1 is fitted with a 2.0L/2.4L engine with a maximum torque capacity of 230 Nm (376.4mm length).
  • The A6MF2 is fitted with a 2.4L engine with a maximum torque capacity of 280 Nm (386.4 mm length).
  • The A6LF1 is fitted with a 3.3L engine with a maximum torque capacity of 329 Nm (386 mm length).
  • The A6LF2 is fitted with a 3.5L/3.8L engine with a maximum torque capacity of 358 Nm (389 mm length).
  • The A6LF3 is fitted with a 4.0L engine with a maximum torque capacity of 392 Nm (402 mm length).

A variation of this little 6 speed can also be found in late model Dodge Dart 2.0L and 2.4L vehicles (2012 and up), which in this application is called the 6F24. In Hyundai and Kia vehicles this would be the A6MF1 transmission (Figure 1many thanks for the good folks at ALTO for the use of this transmission).

In some instances, on the transmission there is a tag riveted to the case with the vehicle identification number on it. Along side this tag, etched into the case is a transmission number (Figure 2). This many times is very difficult to see. If it is readable, and the identification number begins with the letters NA, it is the A6GF1, BA, it is the A6LFx transmission. EA or FA will be the A6MFx. The number etched into the case shown in figure 2 is FABNEA which identifies it as an A6MF transmission. With all these different names, when it comes to Hyundai and Kia, this transmission is simply referred to as the A6 transmission.

A component application chart is provided in Figure 3 for this nicely compacted transmission.  Three brake clutches, two driving clutches and a one way roller clutch are used to operate three planetary gear sets to obtain six forward ratios (speeds) and one reverse ratio (speed).

Figure 1 Figure 2 Figure 3

 

 

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