if your shift lever it tight, sounds like a valve body problem. i saw one 2 weeks ago where the valve body had something misaligned and was stuck in 1st and what ever gear they selected. it was a quick fix, but i dont know what they did. does it go nowhere in reverse, but forward in everyother gear, and try to move forward in park?
if it does that, then i would have your tranny shop fix the valve body
this happened to a tranny that was a month out of the shop.