Hey, welcome to the forum.
I have a 08 TC engine and F35 transmission with 131,000 pulled from my donor. I will not be using them since I have already purchased a new crate LNF and a F40 6 speed transmission for my build. I was not planning to separate the engine from the trans, but from the queries I have been getting for just the engine I may be willing to separate them. I believe most used F35 transmissions are going for around $400, which seems to be a fair price. I would throw in the flywheel and clutch assembly for this price. Let me know if you are interested. I am in Phoenix, the car is from El Paso so essentially no rust or corrosion.