I have an old 80s Ariens that I took apart to check the grease in the gearbox. The grease ended up looking fine, but I replaced it anyway while it was apart. I reused all the old parts, but I did jamb a washer in front of one of the bushings to give it a tighter fit. When it was put back together I did feel a slight drag during one spot of the rotation. I just used it like it was and it has been fine for about 4 years now. Granted it hasn't seen a lot of use in that time.