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Sorry. Just to confrim, checked my vacuum on my M1009 just now; 20 " at idle fairly steady 25 degrees outside cold start.

Summit has a vacuum pump direct replacement for the 6.2 with federal emissions, in stock for $109. Ditto, Advance Auto Parts has them too.

If all the engine mounted vacuum pump is doing is supplying a constant vacuum that is modulated by the regulator on the injection pump, I wonder if it could be replaced with one of these...

I guess the previous owner added an adjustable vacuum modulator to mine. In fact, every Turbo 400 I have every run across had an adjustable modulator. Maybe it's one of those things everyone just does to their rig when the stock mod. goes out. Seems unnecessary since vacuum is already modulated...

When you get your vacuum pump sorted out, adjust the transmission vacuum modulator. Pull the vacuum line off the modulator on the trans and using a tiny flat head screw driver, turn the screw inside the open vacuum fitting counter clockwise to lower/soften shift points and clockwise to firm up...