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I bought an aftermarket valvebody I bought off of eBay from a speedshop in California and had a local transmission shop install it and went with full synthetic trans fluid and it tighten up the shifts a bit. I just tried to contact them and found out they are no longer in business. I don't know if there is any transmission kits for the '11 and newer Sonatas. I will look into it this weekend. If I find anything I will send you a link.
Hey BigDogg,
I noticed that you did some stuff to your transmission to make it shift tighter. I'm guessing a little more agressive. I have an '11 Sonata SE 2.4L and would like to make the shifts more crisp. I know there was a company that used to make shift kits for the valve body on some cars. Not sure if that is something like you did or not? Can you give me some info on what you did? Thanks!