Weird tranny problem

[clean96GST]

Ok so I've been having HG problems, and then thursday night when I started driving I noticed sort of a whining sound at low rpms. Then friday afternoon I am driving and it starts to deaccel like I downshifted, but the rpm's stayed the same, then it went into neutral and back into gear after a short time of coasting. It also died once or twice from what seemed like it shifting into to high of a gear at too low of a speed but idk. what does it sound like to you guys?

 

[theSicKness]

If it were me id check my TCU for burn spots or any other defects..

 

[TFFC]

Pull the codes and see what the tranny is telling you. Its your starting point so I would go from their