Well my Tranny was rebuilt about 9months ago...today i noticed when I merged on the highway was going about 55mph gave it just a little gas car felt like it was bucking pretty bad and not really getting any faster. So I gave it some more it down shifted moved nicely got up to about 78mph set the cruise and went on my way.

Thought maybe one of my wires were burnt or something well that's not the problem so I go to take it out again downshifts fine upshifts fine I floor it and it pulls like normal at at MPH I floor it doesn't slip at all. So I have narrowed the problem down to once the converter locks at 45mph its seems fine but when i give it just a little gas not enough to make it downshift it feels like its not moving so I give it some more it bucks a little struggles to move and then I hear a really weird squeaking sound not constant but with pauses in between. then it smells weird after that. The sound for sure comes from under car the fluid level is fine and is not burnt...but I did think it smelled kind of weird but I could be wrong.

Can anyone confirm the torque converter? I wanna have a good Idea of what it before I take it back to this place.

 

This type of issue would be really hard to diagnosis over the net I am afraid. You need to have and experienced shop check it out for sure . And soon little problems become big ones when put off