Rep Power: 0

It was ok when the car starts from stop after green light. It will shows a hesitation and a jerk/clunk sound after it slows down below 20 mph and comes up over 20 mph again. it is ok for other speed. the fluid is ok and no leaks and no engine light. no burning and crazy smell.

A couple of months ago it starts the slipping at 20 mph part when it is cold and it is shifting ok for other speed. I am in CA bay area and it is better during hot days or warm noon period.

Right now I am opening up the trans for a rebuild. I notice all valves free movement, spring, filter and clutches all look good. I do not know what to look now.