NOS 7 1/4" ring and pinion gears

Still available. My book says with Sure-grip applications, not sure what the difference would be with or without. In any case, PM me if interested. thanks, John
My rear end is non sure grip 7 1/4. Does it mean that this wont be the right part? The part number written on my ring is different from what you have. Could be because its a 63 part?