727 no 3rd gear

Afternoon all,

727 trans, no upshift to 3rd. Before anyone chimes in and says "Adjust linkage or stuck valve doohickey", this is what I've done.

Have adjusted all linkage, no change. As a test, I Unhooked linkage directly from the trans (yes I know, don't drive fast or for a long distance while like this). No change, still only 1-2 and 2-1 whether going manually or plop into D and go.

Changed out valve body, no change. - both valve bodies are stock forward pattern.

Reverse is as strong as a bull. It's not skipping a gear from 1-3 or 3-1, just no 3 at all

All bands, internal and external,have been adjusted correctly to the right spec (Multiple times for good measure) No change.

Filter has been changed, along with gasket.

Have shifted from N to D and D to N multiple times to see if I can get anything to shake loose.

Only thing that comes to mind is a stuck governor.

Anyone else had this issue whether it's a 727 or 904?

Thoughts?