That transmission os the same old overdrive transmission used in most ALL GM front wheel drive vehicles. They are literally in almost everything. You shouldn't have a problem AT ALL finding one in a salvage yard.
4T60-E came out about 91.they were used in nearly all FWD gm cars and vans till 98. The 4T60-E can be identified by the modulator and the fact it does not use a tv cable.
Sorry it took a feww minutes to get back to you, it got a little busy there.
I wouldn't get one out of a van to put in the car, those ratios may be a little different. But pretty much stick to midsize FWD car with a V6, and you will be JUST fine.
4 cylinders will have different torque converters that will let the engine rev a little higher so it build little more power.