[rotorwrench]

Condition is everything on transmission parts. Bearings can even be reused as long as the parts still have smooth surfaces with no signs of pitting, grooving, or spalling. Gear teeth with a lot of wear start to groove a the point of first tooth to tooth contact. The tip of the teeth will get sharper as the surfaces wear. Pitting, grooving, or spalling of teeth as well as any chipping of teeth are not so good. The bearing bore dimension and condition of thrust faces also have to be good. If it all checks to be good then use it. If it lasted that long then it will go a good bit more. New reproductions parts are kind of an unknown unless a person can do hardness tests to insure longevity. I tend to trust a good used part more than a new reproduction part unless those particular vendor parts have been know to function well over time.