Today is the day my Transmission Died?

[NiftySVX]

Well kids, today, my transmission really freaked out on me. Listen to this. I was on my way to the dealer to pick up my $650 worth of tune up parts, and when i merged on to the freeway... third came just fine, forth shift was really slow, and when it hit the car just revved to 4000 and pulled only slightly. I let off the gas and shifted to 3. I got off at the next exit and noticed that my transmission had gone from about 60 degrees all the way up to about 130 when i pulled over, and usually it would have only been about 80 at that point. I drove the car and picked up my parts, all the while I could smell that horrible scent of burnt atf... pulled the dipstick there at the dealer, fluid wasn't too bad. The odd thing is, the transmission didn't ever do it again, and i drove it 35 miles on the freeway and parked it at my parents house, and even under heavy acceleration in 4th it still pulled. Is this a typical failure? I would have thought that it would get worse as the trans heated up...