66 Galaxie with the Cruiseomatic transmission. Tranny has 143K and has never been rebuilt. Recently the transmission has been having a problem shifting into third gear until the car is completely warmed up. I have to drive the car for 4-5 miles until it will go into 3rd. Once it finally does shift into 3rd it is fine going forward. The transmission fluid is at the proper level and was replaced (along with the filter) about 2K ago. Any ideas what may be causing this or is it time for a rebuild? My brother said to try a band adjustment to see if that would help. Thanks!