If you are determined to make your own proshaft rather than buy a custom one, then whatever donor you use, the propshaft will have to be modified.
The Sierra prop is a two piece design with an intermediate support bearing, not really suitable, though the splined gearbox end UJ and the flanged
diff UJ could be hacked off and welded to a suitable bit of tube.
Note that a propshaft is a safety critical item, the welding has to be of the highest standard, and the UJ's must be precisely aligned and
square with the ends of the tube. You do not want a broken prop flailing around inside the car...
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