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Is the torque converter locking up too? Can you duplicate at other speeds since it is shifting early in auto mode? Can you replicate by matching rpms in other gears? Like I said earlier the manual cars do this too but at 2000 to 2200 rpms in third gear at about 30 to 35 mph. So while I hear what you are saying, I wonder if by you holding the shift to later isn't just a Bandaid and not the real fix for the real cause.
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