How Much Vacuum??

AJ/FormS said
Hang on; 750 in N/P and also 750 in gear?
There's something wrong here. It can't be both, unless there's something wrong with the TC or the tach.There is usually about 50 to 150rpm drop from N/P to D/L. And A 750rpm unloaded idle, usually bangs pretty hard going into gear.

There is almost no RPM change when put in gear at 750rpm. The converter is a dynamic 9.5". It may drop a tiny bit but still stays above 700. I'd call it 725 maybe, but that's just splitting hairs.