Sonnax offers an accumulator valve kit, 63940-02K, for the RE4FO4A and 4F20E applications. The kit includes a slightly oversized 1-2 accumulator valve that allows the valve bore to be burnished to remove ridges and to restore hydraulic clearances. The kit also includes two stronger springs, which allow accumulator pressure to be increased to reduce potential valve sticking. Also included in the valve kit is an O-ringed end plug for the accumulator control valve in the lower valve body. This plug prevents valuable EPC oil loss and properly positions the valve for maximum pressure control.