Driveshaft length tolerances +/-?

Dartnut said

When the suspension compresses or you load 600 pounds of groceries in the trunk, the drive shaft yoke will slide into the tranny a bit, and when you jump your car like the Dukes of Hazzard and unload the suspension completely until it tops out, the drive shaft yoke will telescope out of the tranny a bit, but it won't fall out.

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You've got this backwards. When the suspension sags, the driveshaft actually moves towards the transmission slightly. Mine was a difference of 1/8" at full droop. This is because the the rearend pivots on the front leaf mounts, bringing it forward. When the rear compresses, the rearend moves backwards slightly. Still not significant enough to make a difference though.