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741-8 and 3/4 pinion shaft

Yup, seen allot more 10 spline 741's than 29 splines..
 
if its a complete factory center section ,, if the pinion nut is 1-1/8 across the pinion is coarse ( 10 ) spline ,, if pinion nut is 1-1/4 across the pinion is fine ( 29 ) spline , you may also find a 1-5/16 pinion nut there if any work was done on the center section but again 29 spline ,, and yes 741 gears came with both spline counts most early were 10 spline and later units ( 70's ) were 29 spline.
 
I have one that was dated late 1967 on the suregrip that is a 10 spline. It is in my 69 GTX.
 
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