904 acting weird

Run it and then check the dip stick right away.
You will see super fine metal dust (fine enough to get through the filter and into the rest of the trans)
I have a 904 sitting here that did exactly the same thing right down to the no shift after sitting.
My new magnum motor was ready to go in when the 904 did this.
It’s what caused me to go with the 42RH overdrive, since it was going to cost about the same to fix the 904 as to replace it with the OD trans even though I can build them myself.
Not only would I have had to buy the parts to fix it I would have had to tear down and clean the entire trans but also replace the converter and probably the pump as well.
Nope.