I have recently noticed that my sonata has a stumble in the shift to
4th gear. If I accelerate slowly it isn?t that notceable. However, if I accelerate at a good clip that last shift (its in drive) has a hesitation (or stumbles as I feel it) and actually the rpms jump up for a second before it shifts. I checked the fluid level and its fine. I had the trans fluid changedMost likely, it's an internal problem that'll require transmission replacement.
Technical service bulletin 03-40-015 gives details on diagnosing a 2-3 shift flare, but the things we're discussing here could cause this to occur on nearly any shift.
The TSB indicates that the fluid temperature sensor should be checked and that the adaptive values should be relearned prior to condemning the transmission. You can see the TSB (and a host of other useful information) at
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