Thanks @Schurkey, will check all that out. 2 questions, I was also thinking about measuring under load, but what about when not towing? Find a happy medium?NITRO-GIRTH!
"Up" and "Down" refer to the angle of an item as installed on the vehicle, from front to rear. Higher in front is a downward slope, higher in the rear is an upward slope.
Measure your driveshaft angles WITH THE LOAD ATTACHED. I would expect the axle pinion to be a degree or three "down" compared to the transmisson/transfer case, because it'll rise under torque, and under torque the pinion angle should be the same or nearly the same as the transfer-case angle.
Here's a Spicer calculator for U-joint angles. Using your figures of 11, 7, and 5 degrees, all "down", your front U-joint is operating at a 4 degree angle, and the rear U-joint is operating at 2 degrees. Yeah, I bet it shakes. But again, the angles when loaded are going to be more important.
Spicer Driveline Operating Angle Calculator
Measure the angles of each component in your drivetrain, then use the Spicer Driveline Operating Angle Calculator to find the operating angle of each u-joint in your drivetrain.spicerparts.com
and a video showing how to measure and calculate angles:
Measuring Driveline Operating Angles | Spicer Parts
Driveline set-up, diagnosis, and repair is an easy process, but it is often misunderstood. This video offers a quick tutorial that can makes measuring driveline angles a snap.spicerparts.com
Also, what about that reduced driveshaft thing I mentioned above?