I'm pretty sure I already know the answer, but I'm curious if anyone has had any success with reusing transmission gears even if there is some signs of wear on the gear teeth but no evidence of abuse, broken teeth, shearing on the leading edges, etc. I have some extra cluster gears that look pretty good except for some signs of uniform wear across the teeth and I hate to discard them if they still have some life in them. They are worn, but when are they considered "worn out"? I'm curious to know if I can expect them to be noisy or will the cushion of new gear lube quiet them sufficiently. I don't normally install questionable used parts in anything, but cluster gears are so pricey these days, not to mention other transmission parts!