The 489 obsession

The original 741 in my car went well over 100k miles and I beat the hell out of it. I took the cone sure grip out of the original 741 and put it in a 489 case 391 center and eventually the cones wore out. But the original 741 bearings, gears, housing I still have in storage and are in pristine perfect condition no signs of wear on any of the parts.