Originally Posted by vince

Don't confuse the 722.6 with the Ford transmission (I've had both). The 722.6 converter clutch is programmed to engage in all gears and is also programmed to operate with a measured degree of slip.

Mine would groan at speeds between 30 and 40, especially if I let off the throttle and got back on the throttle.

The 722.6 doesn't have a valve body in the sense that the old M-B transmissions did either. They don't even call it a valve body anymore (and it is a lot less expensive). They call it a valve gear and it is basically a way to port fluid from the solenoid valves to the clutch packs.