NO to any of the following can be cause for a tranny overhaul.
Does it accelerate good with the shifter in the low position??
Yes? Then the torque converter is probably ok.
When you manually upshift to 2nd, does it still pull hard??? Yes?? then the clutch packs are probably ok.
When you move it to 'D' (OD off), does it keep pulling hard???
Then with OD engaged does it keep on going???
Yes???
Then it sounds like your problem is either in the automatic operation of the valve body, or the solenoids, or the transmission computer.
Best to have a reputable (meaning one that won't rob you) tranny shop check it out. They may be able to repair it without a complete overhaul.
But...be aware that most shops don't want to do "repairs". They just want to overhaul them. That is because if it screws up after they "fixed" it, you'll get pissed off. So a complete overhaul will fix everything, and you won't get pissed, and everyone is happy. (except you, because it will cost you about $1500)