A hydraulic fluid filler for a motor vehicle transmission includes a set of holes through which respective springs of a spring pack extend. The filler is generally positioned adjacent to a single retainer ring or between two retainer rings associated with the spring pack. In some implementations, the filler floats between the two retainer rings, while, in other implementations, the filler is securely attached to one or both of the retainer rings. The filler reduces the volume of one of two cavities, chambers, or cylinders positioned on opposite sides of a piston that selectively interacts with a clutch assembly to engage or disengage the clutch assembly. Reducing the volume of one of the cavities, chambers or cylinders effectively reduces the time period the spring pack is then able to apply a restoring force to the piston.