I don't know much about the internal working os our trans, nor have I ever actually rebuilt one besides things like seals and bearings. My current transmission sounds like it is full or marbles and I'm tired of parts swapping shit trying to resolve the issue. I have a trans here that was pulled from a known running good car and supposedly had no issues. Signs point to the trans being rebuilt at one point but I personally never drove the car or know what it felt like. I have looked online for examples of what to look for as far as bad/worn synchros and gears but found very little if anything at all. So I took some pics of this one while disassembled and wanted opinions.

I'm waiting on new seals to come in and I still need to pull the one currently in the car to swap over the hardened output shaft. Anything else I should look for while it's apart? Can the VCU be Manually tested to see if it is blown or not?