Anyway, apparently the code TY751 refers to the current transmission case, which happens to be the same case as the 2005-2009 NA 2.5i Outback. However, the newest Crosstrek truck has another additional shelter (more on that later).
Anyway, in this thread I’ll go into detail about the changes I made in order to make this swap work for the 3rd gen Outback. And I’ll tell you right now – this exchange is mostly plug-n-play. 👍
Now, let me briefly go over why I wanted this tranny: it’s because of the sweet gear ratios!!
TY751VDJDA / 32000AK470 (2018-2021 Crosstrek)
First – 3.82 (19.5% shorter)
The second – 1.95. (2.1% shorter)
Third – 1.30 (3% longer)
Fourth – 1.03 (2.3% shorter)
Fifth – 0.82 (1.7% shorter)
Sixth – 0.74 (8.2% longer than Outback 5)
Reverse – 4.07 (32% shorter)
FD – 4.44
As you can see, first gear is significantly shorter than our first gear, while the rest of the gears, excluding 6th gear, are mostly the same. I chose this gear because I wanted the shorter first gear to help with off-road play. Also, having that 6th gear makes highway driving even better, as this is my daily driver. And finally, after rebuilding my engine, I also want a newer transmission to be able to keep up with it!
***However, the 4.44 final drive means you MUST replace the rear differential with a unit that also has a 4.44 ratio (more on what I did below).
The recipient vehicle is a 2006 Subaru Outback 2.5i Limited. This has the NA EJ253 engine…
The donor vehicle is a 2018 Subaru Crosstrek that was at a premium wrecker (ie, not self-towing) in Colorado. I found it through car-part.com and had the throttle body send it to me. This is what it looked like when I got it…
Next, I needed to mount the shifter as this new trans is a cable style. With cable shifters, you actually have the option to use almost any 6spd cable assembly from Subaru. However, I was able to find a shifter from a second generation Crosstrek, complete with cables, at a local premium wrecker for a fair price. This is what it looks like…
Now, I’m not going to go through every step of the swap, since if you’re thinking of doing this, you should at least know how to swap a transmission that was built for the car. Instead, I’m just going to tell you what to expect in terms of how the new truss works!
First and foremost, the Crosstrek transmission not only uses the same main case as our stock unit, but also shares the same mounting points, ring count, and bell model+dimensions as our stock.
Straight Outer Truss Mounting Bolts No Modification…
The outer support shaft is inserted directly into the…
Outback axles also plug in…
The outer clutch, clutch fork, TO bearing and slave cylinder (not pictured) fit perfectly….
And finally, here are some pictures of the stock 5spd along with the 6spd. As you can see, the overall dimensions are very similar and the bell design is identical. Also, the harness plugs are exactly the same.
The external difference between these two is really only in the extension housing; but, even this is not very different!
To be continued…
