Slip yoke question

HawaiiDuster said
18 spline does refer to the Hemi input shaft. If the splines aren't even engaging you might have a 904 yoke. The 904 yokes are also available for the big (7290) u-joints.
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I don't think its a 904 yoke b/c I tired my old 904 yoke that I removed and its not the same diameter as the 727 input shaft.