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Transmission Swap?

2132 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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I think it is possible to swap out manual transmissions in cars that originally came with manuals, However I think you'll need the ability to upgrade the car's computer controls - Most likely you'll get irritating warnings and set driveline codes because information won't match up (Rpm Vs MPH, speedometer inaccuracies, and such). You would have to research compatibility, such as the axles - might be lucky if they are the same between transmissions with different ratios, for example

In Auto equipped cars the ECM "talks" to the TCM and BCM so I expect this to be somewhat the case with manual transmissions too - but I honestly have no experience with modern Kias and manual transmissions to know if it is the same. I've been trying to find out if manual equipped Fortes have a TCM or not.
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Yep...it's not like the "good old days" when you could "shoehorn" practically any engine/tranny combo into any car in a weekend...LOL!

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