Follow along with my custom Beta six speed transmission!

I know that there is an actual six speed transmission for the Beta but it seems to be only available in Korea. I was doing some research a couple years ago in regards to a potential stronger transmission for the Beta and noticed similarities between some of the newer Beta II, Alpha II and 6 speed transmissions in newer Hyundai/Kias. From there I began a more in-depth research and built the following transmission

I think I'm going to call this a Beta 2.5 transmission.

Teaser pics for the time being!

 

To start off this journey I bought three different Hyundai/Kia transmissions, tore them apart and pieced the parts together to make one custom transmission.

The transmission models I used are below.

• M5CF2-1
• M56CF2
• M56CF3-1

These first pictures are of the M5CF2-1 transmission which I found to come in a 10-12 Hyundai Elantra Touring. I believe this transmission also comes in the 09-10 Hyunda Elantra and the early Kia Soul.













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These next pictures are for the M56CF3-1 transmission which is common in the newer Hyundai Veloster and Kia Forte.

 

Finally, the last set of pictures are for the M56CF2 transmission which should be found in the 07-08 Hyundai Elantra.

 

Started to tear down the transmissions and you can see how similar these two are to each other.

The first two pictures are the M5CF2-1 and the last two are the M56CF3-1.

 

Teardown of the M56CF2 transmission which is vastly different. This is similar to the M56CF1 transmission which comes factory in the MC Accent.

 

I did a side by side comparison of the various transmission internals. Listed left to right are as follows.

• M5CF2-1
• M56CF2
• M56CF3-1

Output shafts




Input shafts





Differentials

 

Here are some more comparisons but of the various shifter forks and the reverse mechanism. The shifter fork pictures are only of the M5CF2-1 and M56CF3-1 transmission as the forks from the M56CF2 wouldn't be compatible for what I was trying to accomplish.

 

Even though the gears from the M5CF2-1 and M56CF3-1 look almost the same, there are some minor differences. Based off of the measurements, they are the same gear ratio and appear to be interchangeable.

 

The first and second gear on both the M5CF2-1 and M56CF3-1 use a brass triple cone synchro. I noticed that third through sixth gears on the M56CF3-1 use carbon fiber based synchros. You cannot swap the synchronizers without using the corresponding gear.