i may be thinking of another part of the mc 4.7 gears, but i believe the older generation of mc 4.7s had less surface area on the teeth..i think where you had the issue. i cant tell my looking at it how old it is though. i know all the new ones have a lot more gear surface area because people kept having that issue, they basically made that little gear section longer. im pretty sure people havent had any issue with the new heavy duty mc 4.7s. they also make the chromo ones know. would be cool but kinda overkill and pricey.