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Old 07-01-2011, 08:49 AM   #3
Tx Firefighter
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Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
Re: SLIP YOKE QUESTION for 1970 C10

That's called a blind spline. It's normal. GM did not use it in this application, but the yoke maker broached it like that anyway.

The reason for it it to allow one way indexing on something onto a splined shaft. The shaft would have the matching spline so you could only install the yoke exactly indexed with it.
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