Tranny problems

The trans is mine.Trans is a little over filled but not shooting out the vent. The trans was just rebuilt with a shift kit and new valves in the valve body. It must be shifting into second in drive postion cause when I leave off the gas and if I shift manually to first after going around 25-30 mph I will shift back into first. The kick down linkage is not set up at all yet. Sounds like a band adjustment is needed. Any other tips?