Some of the savage gears are poor quality, the molding process was bad. You can see from the side of the big gear, if te top of it is round, it's bad. the ones you've got are those a 4spider or 2 spider kits? the molding problem HPI suffered only took place with the 2spiders.
well they arent actually hpi gears they are kyosho gears but they are the same size as the savage ones. they are normally used for the mad force and the mp-7.5 buggy diffs.
Mike said hes gonna list the 8 spider diffs for my this weekend so i'll order them and see if the gears are the same size.
well i was gonna get the 6 spyders but now im gonna get the 8 spyders, just like you serum :) are the 8 spider diff gears different to the 6 spyder ones?