Boost Valve

WARNING: This page is about a different car, the 2004 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.

The boost valve (Fig 1) provides increased fluid apply pressure to the overdrive clutch during 3-4 upshifts (Fig 2), and when accelerating in fourth gear. The boost valve also serves to increase line pressure during torque converter lock-up.

Fig 1: Boost Valve Diagram Before Lock-up

Courtesy of DAIMLERCHRYSLER CORP.

Fig 2: Boost Valve Diagram After Lock-up

Courtesy of DAIMLERCHRYSLER CORP.