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What would cause a transmission to shift slowly from park to drive? on 2001 Volkswagen EuroVan

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It shifts slowly from park to drive. Once in drive it shifts fine while you're driving down the road.
(1) Answer
temporarily solve slow shifts by screwing in the pressure regulator valve. The root problem is that valve body wear or a weakened pressure regulator spring causes lower fluid pressure. Replacing the valve body with a modified, rebuilt unit which incorporates some of the supposedly improved (over OEM) valve tweaks like Sonnax offers would fix most Eurovan transmission problems relatively inexpensively and maybe even permanently without removing the transmission from the vehicle. It looks like replacing the valve body is about as difficult as changing the filter.