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hum, ok. I'll adjust mine after I get it back up to running shape.Yes, This pump provides vacume for the transmission modulator. Since the 6.2 has no throttle valve like a gas engine there is almost no vacume in the intake manifold. This pump provides the vacume and is piped into the valve on the IP then down to the vacume modulator on the passenger side of the transmission. Just above the trans oil pan. It's a round canaster about 1 1/14 inch in dia. You rotate the valve on the IP eather forward tward the rad, or backward tward the cab. This will adjust your shift points to your preference. I adjust mine to shift around 2300 PRM's to keep the engine in it's max tourque range. Any higher than that and my truck does not pull heavy loads as well. Too high and it over revs and looses power. Too low and it boggs down and struggles to accelerate. Adjust yours to your loads and driving style.
I wonder how it worked before without the vacuum even being connected? It seemed to shift ok and such...