970 diff backlash

Got new ring and pinion in my 970 (manual trans) and I?m setting the backlash, the service book says to ONLY check backlash when the marked teeth are line up. Would you not want the backlash to be the same all around? Why only that position? Tough to see the marks, maybe an inspection camera would do the trick but I do not want to take that big top cover off. Thanks
 
In my world, I like R&P backlash around .003, all the way around. NO tight spots....... Checking the contact pattern with bluing is a nice touch too. I'm sure the factory book explains that. Larry
 

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