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Transmission Swap?

2134 Views 9 Replies 6 Participants Last post by  FIN3SSED
Hello fellow Forte enthusiasts,

I have a 2017 Forte5 SX (1.6T, 6M) with about 85k miles, and I've owned it for a little over a year and about 20k miles. For the most part, it's a fine little car, especially for what I paid (Thanks previous owner for taking the depreciation 馃槈). One of my main complaints about it, though, is how short the gearing is, especially in 6th. I do a lot of highway driving, and 3k rpm at 70mph gets old pretty quick. Thankfully the stock exhaust and interior do a pretty good job of masking the noise, but I only average about 32mpg, which for a little car with a little engine, especially with it being only 4 years old, is not grand. I'm also not thrilled about driving for hours on end at an RPM I rarely see on the street (yes, I granny shift the heck out of it).
So naturally, when I found out that it's Hyundai sedan contemporary, the Elantra Sport, has longer gears from 3rd-6th, it piqued my interest. And when I saw that I can purchase one of many used transmissions on eBay for $400-500, that comes with a (short, but free) warranty and return period, and that came out of wrecked cars with half or less-than-half the mileage on my car, I became very, very intrigued as to whether or not I could swap my transmission for one from an Elantra Sport for some better mpgs, less highway NVH, and less engine wear.
I'm wondering if anyone here has any information at all about anything that might keep me from being able to do this, i.e. if the mounts are too different to work, different electronics, different axles, etc. If not, I might find myself with an extra transmission once I notice my clutch beginning to give way, and test fit the Hyundai trans in my Forte while it's trans is out to see if it's potentially possible.

P.S. This is my first time ever posting in a forum, so if there's something I did wrong or can improve upon, feel free to leave constructive criticism in the comments. Thanks!
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Most likely you'll get irritating warnings and set driveline codes because information won't match up (Rpm Vs MPH, speedometer inaccuracies, and such).
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I've been trying to find out if manual equipped Fortes have a TCM or not.
That's something I'm worried about, and should probably check and see where the speed sensor gets its reading on these cars and what all the car uses it for. My car has a "shift indicator," but I think it only uses gear position (obviously), load, and RPM, not speed.
I don't believe the manual cars have a TCM, since there's really nothing it can control. All the inputs and gear changes and such are mechanical or hydraulic. I'm sure there are plenty of sensors, but I think they communicate with the ECM and BCM, and not its own TCM.
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I was wrong. The car uses vehicle speed and engine speed together to recognize what gear the car is in (so the shift indicator does use speed), and is a major input to the ECM. @ForteGT2 you were totally right when you were concerned about the RPM/speed info not matching up. Total bummer. 馃槚馃槚 I've enjoyed all the newer technology in this as opposed to what's in my 25+ year old Volvo or Nissan, but now I've to get used to how prohibitive the electronics are in newer cars. Thanks, guys, for the support regardless!! Sorry I can't give you anything to look forward to.
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@PLP I was initially hoping that they would be similar enough to be a relatively straightforward swap, but was wrong. I'm used to older cars haha. The DCT has its advantages, but I do enjoy driving a stick shift much more than an automatic, even with the shift paddles. Maybe I'll just start saving up (a lot) for a new Civic Si or Integra :)
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