I have driven the car a little over 150 miles since getting it on the road. I have been slowly changing fluids and doing other small maintenance items all while looking for any issues. I drained the trans and converter and replaced the filter and gasket. After replacing the fluid I expected the slightly rough shifting to be gone but it isn't. Honestly the pan and old fluid/filter was so clean I feel kinda bad I did the work. Should I consider adding some sort of additive to the trans, or is there an adjustment that should be made?