The joints you are dealing with are not shown in the chart.
1.125" Diameter bearing cups....(GM/Saginaw 3R Joints) Spicer number 5-3147
Just happen to have a couple of these Bad Boys on the shelf for the Snow Cat shaft.
The 3R Saginaw has 1.125" cups...Just slightly smaller than the 1350 Spicer.....the overall width is slightly larger than the 1350 at 3.650"
Basically the 3R is about the same strength as a Spicer 1350
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