Yeah take another .006-.008 out and go from there, it may be too shallow but then you'll see you need to go deeper. I suspect another .004 may be ideal, but its better to go too far and then go back so you see it both ways. Might as well set the backlash so its in spec when you're making larger adjustments. Remember the 70% rule... So if its .012 now, to bring backlash into spec you need to move about .008 of shims, if you move the pinion another .004 you'd need to move the carrier about .012. When making small adjustments it not that important to keep changing the carrier shims, but you want to keep in range when making larger adjustments.
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