Try this post, https://www.stovebolt.com/ubbthreads/ubbthreads.php?ubb=showflat&Board=1&Number=340366&Searchpage=1&Main=47196&Words=dana+%2Bspicer+%2Bdriveshaft&topic=0&Search=true#Post340366
and download/print the Dana/Spicer manuals I linked to. They will answer all your questions and then some.
Some quick answers:
Don't worry about pinion angle with a torque tube, that's a whole different ball game, and nothing you can do to change it.
Set pinion angle with the truck on a reasonably flat surface, and loaded how it will be most of the time when driving, full tank of fuel, driver, and all wheels on the ground, spare tire installed too if you carry one.
Pinion angle is not so much a number, but a measurement that must be the same angle as the angle of the front u-joint, simplified it means you need the pinion centerline to be parallel to engine/transmission centerline (one piece open driveshaft) read the manuals for more details.
Yes, driveshaft length is measured with truck loaded as it will be most of the time, and with the slip portion of the shaft in the approximate center of it's travel. Also good to test that there are no problems with the frame bottomed out on the axle, and the axle at full droop, wheels off the ground.
If you don't have a slip section in the driveshaft its self, Then you have to have the slip yoke in the back of the transmission, many automatics are this way, many manuals are not.
Grigg
