Driveline Length/Factory Specs ???
the FSM gives it as center to center
however, i don't know how you're going to measure it to double check without a yoke in the trans? i mean, unless you have a spare. and remember to have all 4 wheels down with the weight of the vehicle on 'em when you measure.
the one thing i've learned in all my time dealing with driveshaft shops is always ask how they want the measurement.