Driveline Length/Factory Specs ???

My question is if the numbers given in the Factory parts/chassis manual is an overall length, center-to-center measurement, or some other nebulous choice, like tailshaft seal lip to rear u-joint center...???

Chrysler specified the length of the propeller shaft as measured from the center of the universal joint bearing cap hole on the transmission end to the center of the universal joint bearing cap hole on the axle end.

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