Well it's my first time on this board hope you can help.
I was heading home and have to go up this hill, well she shifted down to second then as I crested the hill, she went to shift back into third and would'nt grab just sliped, tried to shift manualy no luck. I could feel it tring to grab but no go. Is this a valve problem or clutch band, trany fluid looks and smells fine.

 

One simple check would be the governor gear, it's under a round cover on the drivers side, the gear costs $5.

 

Does it move at all now? How about in manual low?