As far as i know (which may not be much) the front one should be a dowel, as it is hardened and can shear if need be, sort of a sacrificial break in lew of something more costly to the driveline...the rear one should be a spirol pin, Which isnt a roll pin and which will not break...all this being said; i put spirol pins in both ends of mine when i did it...also i do the same mod mr bedell mentioned about the 2 flex disks, and slightly longer bolts...especially for the quietlines...
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