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I would echo spidertri comment about having the incorrect ratio carrier. There is a carrier break in these units for <3.07 and >3.15
It would seem you have the <3.07 unit and your diff is a above the break. In my experience numerically lower ratios will use a significantly larger pinion head, and therefore need more space between the pinion head and ring gear mounting surface to achieve the correct backlash. Since your ratio is numerically higher, you had to fabricate the spacer.
Do you have the link to the Blackline diff you purchased? That will help confirm the idea.
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