Its crazy what salvage yards are charging these days , I called this morning to find a 4L80E for my 91 V3500 and they told me it was gonna be 1300.00 without the convertor our computer . I told the guy I could have mine rebuilt for that much with a warranty . His answer was "Well do that then quit bothering me." and hung up
wow, I do have a few u-pull it yards near me that are very reasonable, the selection is not always that great (at least for what I'm looking for) but as an example; a car or light truck rear end assembly lists for $65
a transmission is $90 with a $10 core.