I drove my auto '85 K5 about 140 miles from home to school a few weekends ago and as I got off of the interstate I noticed that the engine was revving up really high and not kicking into 2nd and 3rd gears when it should. I checked the atf and it was low, so I topped it off and that fixed the problem for the time being. This weekend, I went on a camping trip with some friends and had the same problem, despite correct fluid levels, and it seemed worse than before. I don't have a tachometer, but it sounds like it's revving to about 4000 or 4500 rpm before shifting? When we returned from the mountains, she just shut off almost right after I got off of the interstate; however, the radio did not turn off and I was immediately able to restart her. I don't driver her much since I'm in school, but this has me rather perplexed/worried. Anyone have any ideas on this one? To the best of my knowledge the trans is a TH700-R4. Thanks!