Overheating Problem

[nonovurbizniz]

no I can't imagine how the tranny would be the cause.

it has to be in the cooling system... it seems like it's all been replaced either right now or a while ago..

It's really a decision you have to make if it's worth it to you to get the waterpump done again just to see if that fixes it. (while your doing that you'd be silly not to do the timing belt (unless it's a chain))

If thats too much to bother putting into it then just sell it. or trade it in and take a hit.