Beta 6-speed transmission build
 

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!

https://cimg7.ibsrv.net/gimg/tampara...42f48011df.jpg


https://cimg2.ibsrv.net/gimg/tampara...363dba9e45.jpg

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.


https://cimg4.ibsrv.net/gimg/tampara...7b5e8d4a49.jpg


https://cimg6.ibsrv.net/gimg/tampara...1cfe632575.jpg


https://cimg7.ibsrv.net/gimg/tampara...b34b071540.jpg


https://cimg8.ibsrv.net/gimg/tampara...3bbf69fa52.jpg

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


https://cimg4.ibsrv.net/gimg/tampara...346e0e2614.jpg


https://cimg5.ibsrv.net/gimg/tampara...3b6ac88105.jpg


https://cimg6.ibsrv.net/gimg/tampara...19e5d0ac99.jpg


https://cimg7.ibsrv.net/gimg/tampara...eac7aef990.jpg

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



https://cimg0.ibsrv.net/gimg/tampara...75dffab984.jpg
https://cimg1.ibsrv.net/gimg/tampara...d1d0e1ca9d.jpg

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.


https://cimg0.ibsrv.net/gimg/tampara...2f739bb9b7.jpg


https://cimg2.ibsrv.net/gimg/tampara...cd52499a80.jpg


https://cimg6.ibsrv.net/gimg/tampara...0e79842048.jpg


https://cimg7.ibsrv.net/gimg/tampara...73c8549773.jpg

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


https://cimg8.ibsrv.net/gimg/tampara...efa25697e4.jpg


https://cimg9.ibsrv.net/gimg/tampara...b50bea4167.jpg

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

https://cimg8.ibsrv.net/gimg/tampara...b6612250c8.jpg


Input shafts


https://cimg1.ibsrv.net/gimg/tampara...e7ae211706.jpg


Differentials


https://cimg2.ibsrv.net/gimg/tampara...e8f3061e97.jpg

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.


https://cimg8.ibsrv.net/gimg/tampara...187ec2ba21.jpg


https://cimg7.ibsrv.net/gimg/tampara...cedde11c27.jpg


https://cimg9.ibsrv.net/gimg/tampara...dff92410b0.jpg


https://cimg0.ibsrv.net/gimg/tampara...d5b83d1e1e.jpg

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.

https://cimg0.ibsrv.net/gimg/tampara...b7c67397d9.jpg


https://cimg1.ibsrv.net/gimg/tampara...6febdc3833.jpg


https://cimg2.ibsrv.net/gimg/tampara...48612afb6d.jpg


https://cimg3.ibsrv.net/gimg/tampara...fdba03f1d1.jpg

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.


https://cimg1.ibsrv.net/gimg/tampara...e6d4ac879b.jpg


https://cimg6.ibsrv.net/gimg/tampara...f3e24845f8.jpg


https://cimg9.ibsrv.net/gimg/tampara...a24ce3a859.jpg


https://cimg0.ibsrv.net/gimg/tampara...39e6ab4f20.jpg