Backlash is the space between the pinion and ring gear mesh. I don't know the exact number you want but you want the pinion gear to mesh properly with the ring gear so theres not extra stress on the edges of the gear teeth.
Does that make sense? Sorry if i'm not right I can't quite remember.
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1985 Mazda RX7 GSL 13B, Holley etc
1997 Mazda MX6 LS - DD lowered on 17s
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