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A new manual valve is provided with the Transgo kit. The manual valve directs the trans into gear when you move the selector (shifter). The OE manual valve doesn't allow the transmission to pump oil while in Park, making it necessary to check our trans fluid level in Neutral. Transgo's replacement manual valve makes the transmission pump oil even while in Park. This is a particularly important feature that would benefit any vehicle that spends a good deal of time idling, e.g., emergency and delivery vehicles, because lube will continually flow through the transmission. Now we can check our fluid level in Park.