Chrown HEAVY DUTY STEERING SHAFT.

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Just bought one of these on ebay and was wondering if someone can tell me how I can identify if I have the correct part when I get it. Such as, how do you know it is the heavy duty Crown part and if it is for Power steering? Thank you

 

[73CJ]

The lower coupler has a different spline size.

A little more info would be helpful so we can help figure you.