help please...trans problem

[2genfun]

so my trans has a mind of its own apparently. so its an automatic and the 1-2 shift is at 4k rpm the 2-3 shift is also at 4k. but if it doesnt shift into 3rd and u let off the throttle it acts like pushing in a clutch pedal. Also yesterday morning it didnt want to go into reverse, like it wasnt engaging into the gear. The shifter would work and the reverse lights would come on but no moving even if u rev'd it up a lil. Eventually idk if it had to warm up but it finally did engage. Last but not least when coming to a stop, sometimes it likes to stay in gear and not drop into neutral when stopped so it stalls out and i have to neutral drop it to get get going again....Rebuild or i heard something about the linkage may need adjustment?