I need to adjust the backlash on my Super 55 differential. According to the manual, the backlash setting is stamped on the ring gear. The only markings I could find are 8620 if I read it correctly . What is the meaning of that number? 

Is there a typical backlash setting for a Super 55? I have enough shims to set it at whatever I want, but I'm not sure of what it shoould be.

Thanks a lot

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