I think the best you can do is ask whomever is going to shorten your DS as to how they want it measured.
I always put the front yoke in the trans as far as it will go in, pull it out an inch. With the suspension loaded measure from centerline of front yoke U joint bearing bore to flat of the rear yoke. The flat of the rear yoke is the centerline of rear U joint bearing.
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1978 Black & Gold T/A [complete 70 Ram Air III (carb to pan) PQ and 12 bolt], fully loaded, deluxe, WS6, T-Top car - 1972 Formula 455HO Ram Air numbers matching Julep Green - 1971 T/A 455, 320 CFM Eheads, RP cam, Doug's headers, Fuel injection, TKX 5 Spd. 12 Bolt 3.73, 4 wheel disc. All A/C cars
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