Why would my 3rd gear suddenly start to slip?

In my 2002 Hyundai Sonata, out of nowhere my 3rd gear is shifting so hard that it feels like I hit a huge hole and the car shakes badly. I ask a locate mechanic and was told that it could be electrical due to the fact the i recently changed my head unit and speakers yesterday. Also it isn't slipping every time, maybe once out of every 5 times it shifts smoothly. I also checked my transmission fuse which looks fine. Another person said it could be something called a brainbox that is located under the battery. Any ideas? THANKS!

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  • 9 years ago
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    I have always drove SONATA AT!!!

    well the problem in your MT may be the the 3rd gear would got screwed while meshing, just a simple service should help you out. You may have to replace the gear set if it has completely worn out.

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