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Is the u-joint with part# 18-6406 the correct part for my volvo penta sx-m1 drive?
No this is for Mercruiser motors. This part is not sold separately for your outdrive and it will depend on gear ratio.
Could you tell me the dimensions of the u-joint? I would like to know the width of the cross with both caps on and the diameter of the caps. Thank You, Jeff?
Sierra does not have the specs, they can only match it up by motor application.
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