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This came straight from Summit
https://www.summitracing.com/parts/aub-342066?seid=srese1&gclid=EAIaIQobChMI8uiwqtGx5gIV0_7jBx0zsgT3EAQYASABEgK7QPD_BwEAuburn Gear Ring and Pinion Sets 342066
NOTE:
The ring gear has 37 teeth, the pinion 9 = 4.11
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Summits description
Ring and Pinion, 4.10:1 Gear Ratio, Ford, 9 in., Set
Differential Case Design Type:Ford 9 in.
Ring and Pinion Ratio:4.10:1
Pinion Spline Count:28
Ring Gear Rotation:Standard
Ring Gear Teeth:41
Pinion Gear Teeth:10
Ring Gear Diameter (in):9.000 in.
Pinion Shaft Diameter (in):1.313 in.
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Shaft end
F9-410
Is stamped on pinion
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136 4.375
9 teeth
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Ring gear
There is a "136" and the other number is in one of the pics
There are marked by hand
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The number below is stamped
K F9-410 071 2
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Summit Racing SUM-G7914K - Summit Racing® Basic Ring and Pinion Installation Kits
https://www.summitracing.com/parts/sum-g7914kRing and Pinion Swap Basics
The Summit G7914K Basic Ring and Pinion Installation Kits include carrier bearings that measure 1.78 in. inner diameter and 2.89 in. outer diameter.
$140.00 for both plus shipping
Ricky.