For efficient transmission operation, the bands and multiple-disc packs must be released and applied at the proper time. The valve body assembly (Figure 40–49)is responsible for the control and distribution of pressurized fluid throughout the transmission.
This assembly is made of two or three main parts: a valve body, separator plate, and transfer plate. These parts are bolted as a single unit to the transmission housing. The valve body is machined from aluminum or iron and has many precisely machined bores and fluid passages. Various valves are fitted into the bores, and the passages direct fluid to various valves and other parts of the transmission. The separator and transfer plates are designed to seal off some of these passages and to allow fluid to flow through specific passages.