Spline count for 8 1/4 rear end?

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gagembassett

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I have an 8 1/4 rear end that I'm just tinkering with and throwing back under a D150. Switching from a 3.23 open carrier to 4.10s and a sure grip. Would the axle spline count for an 80s D150 8 1/4 be 27 or 29?
 
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