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To get the ATF level correct the engine Must be running and the ATF warm when you top it up, did you do that?
A harsh 2-3 shift can be caused by a dirty or inoperative transmission Range Mode Switch (RMS). The RMS is powered by the Turn Signal and and Backup lamp fuse. Do your turn signals work? Does the gear selected lamp on the instrument panel match all 7 positions (PRND32L) of the shift selector?
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