You can't look at one truck and then decide what the driveline angles on another need to be. It may get you in the ball park, but the specs say you need your angles to be the same within 1 degree, you could be off several from one truck to another depending on weight, spring size, worn out springs...
Just take your measurements and make it work out for your truck.
If you don't have the truck assembled, put it in loose, without welding the spring pads, then assuming you won't be driving in in the mean time, once the cab and bed are in place fine tune the angle and weld them in place.
Or get it close as you can, weld them, and when the truck is complete plan to double check and use shims to adjust if needed.
Grigg
