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Hello All, I have a 2004 Elantra GLS with an auto tranny. I just replaced the tranny with one from a salvage yard with 62k on it. I topped off the fluid using Hyundai's SPIII, let it run until it reached operating temperature, and took it for a test drive.

The tranny is still shifting hard from 2nd to 3rd gear (this was the previous issue with the old tranny). Do I need to reset adaptive values, or reset the TCM?? I'm definitely lost and frustrated at this point. I put a lot of work into this car and just want it to run right. Any help is GREATLY appreciated!!
 
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