Transmission is shifting slightly rough from first to second...smooth the rest of the way, but will not enter fifth if the car is not going more than 40ish mph. Also, I purchased this vehicle used with 68000 miles. Checked the trans fluid and it does not look low or dirty. It currently has 86500 miles after 2 years. It is an 07 3.3L What do you think is the right move? Drain and fill? Say no to flush i refuse to flush it but do you think a drain and fill w/ filter replacement is safe to do/might resolve these issues. Also, whenever i get off the gas its like the car downshitfs and then when i get back on it a little it will shift back up. Very odd. I havent had issues with slipping or slamming or dragging none of that. Very smooth shifting overall, but these little things worry me.