Yes its normal.
Here are some facts to help you.

-The working angle of the ujoint should not be more than 5 degrees and not less than 1 or 2.
-The driveshaft doesnt care if the angle is up and down or side to side.
-If the rearend used 2 axles the same legnth, the pinion will be offset and if the pinion is centered your axles are different legnth.
-The angle of the tailshaft (or crankshaft centerline) and the pinion angle must be the same but on different planes, or parellel, (creating the working angle of the ujoints)

Hope this helps.