I seen one of these disc's while searching for parts at the local salvage yard but had no idea what vintage or model it had been removed from. I am currently resealling the pwr shift on a very early 870 which this was removed from. I have ben doing this for more years than I care to mention and this is the first time I seen one like this in a tractor. I know some of you have heard horror stories about Power Shifts in these tractors, but trust me most problems are abuse or lack of maintainance issues. This tractor is well over 40 and this P.S. needs only a seal updating and brg just to be safe with over 10 thou on the meter. Rod.