I have a used trans to swap out my blown trans, i have normal jacks and stands and was wondering where to jack up the car for the transmission change if the pinch welds arent solid

 

Assuming you're pulling it out the top, you could always just jack it up using the engine cradle / put thr stands under the cradle also.

 

Pinch welds being bad are a common issue. About 1 ft further under the car is what looks like frame rails. That would be the safest place to jack up and put strands underneath. For the back you might need to use your best judgement. Perhaps car ramps might be the best answer.