automatic transmission shifts hard when engine is cold

if you have more than say, 60k miles on the car, get the transmission serviced or flushed. I don't know whether the filter is accessable or not, you'd have to ask a specialist. Some Hyundais have a spin-on trans filter like an engine oil filter, you might look for that. I recommend you go to a transmission shop with Mitsu or Hyundai experience and ask for advice for your shifting problem, or find a Mitsu or Hyundai specialist shop. If you want to find a specialist, here's a directory link for you: https://repairpal.com/hyundai-repair-in-east-hanover-new-jersey .

we would need to run tests but call me and i can explain further bob,country road auto 973-696-6636