Editing Driveshafts: Swap solutions

This "Swap Solutions" series of Wiki articles is intended to help the customizer, swapper, shade-tree mechanic, or junkyard crawler.

The idea is  this: when you pull an axle, engine, tranny, driveshaft, bearing, or ANYTHING from your car, measure the heck out of it. 

Countless times I've found myself wishing I had a source to know if this axle will fit that car, how much that ISB Cummins engine weighs, or if a driveshaft already exists that fits my custom install instead of paying to have one fabricated.

This article is for Driveshafts. An often overlooked, there are a wide variety of driveshafts available that might make short easy work for your swap. While you have yours out, grab a tape measure and let the world know.

#Driveshaft length, from center of the front Ujoint to center of the rear Ujoint.
#Tubing diameter
#Tubing material... most will be steel, but some are aluminum or fiber these days.
#U-joint size, front/rear; 1330? 1350?
#Tranny yoke style.