Prior to replacing the automatic transmission fluid (to improve shift quality), make sure that the transmission fluid level is correct. Also, make sure the computer that controls the transmission has the most up-to-date adaptive programming information. When servicing these transmissions be sure to use fluid approved by Hyundai.
Poor Shift Quailty of Automatic Transmission on Hyundai Sonata
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2006 Hyundai Sonata105,000Visitor
middle gears noisy, difficulty shifting; still accelerates, but sounds like it's still in 3rd gear - even on the highway!
auto transmission shifts hard when driving some of the time, mostly downhill
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