Engine revs while driving... HELP

[Ardee83]

Ok I will do my best to give as much detail as possible.......

Setup 83' SWB 2wd brand new 350 (800 miles) with a rebuilt 700r4 with 23k miles on the rebuild and was told it had a shift kit.

About 2 weeks ago I noticed that when I am driving in OD, 4th gear around 60mph and just keeping it steady at 60mph and 2k rpm the engine will rev and the tach will jump from 2k to 2300 to 2400 and the truck springs forward, then settles back to 2k.

So I did a test and drove the truck at 60mph in Drive, 3rd gear. No revving, so I slowed down so I was running 2k again no rev shifted back up to OD. The revving issue started again.

When I got home I checked tranny fluid, it's perfect. Checked the plugs and the wires, looks perfect.

I did record the tach jumping so others can see what it's doing, sorry I was driving and its not hollywood quality, but you can see about half way through the video it starts jumping. http://youtu.be/jT1XqpVR80I

I am not sure how to proceed from here...............
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