904 Reverse/1st gear issues

That's correct, in Drive ... it shifts 1.2.3 just fine. If I manually shift from Drive or 2nd to first there is no engine braking. So would this isolate the problem to a faulty low / reverse band?
Hyup
But run the pressure test anyway, to possibly save the rest of the trans. Like I said; there is zero pressure regulation in reverse.The gauge will be seeing max pump pressure.IIRC the spec is at 1600rpm
That servo should WHAM in.