I have a set of 3.23 gears for a 489 case. I don't know what the history is, they came in the 8-3/4 I bought used. The pinion has one tooth on the drive side that is mildly pitted, the rest of the teeth look good. The ring has about 15-20 teeth that are more pitted as shown. Are these gears still workable? They are extras I was going to sell, but I don't want to pass them along if they are junk.