Good pickup - Yes, it is normal, and it's exactly the same as every other 4WD with a "low pinion" front diff. (There's lots of them) and it's the way your sierra came from the factroy - both front and rear gearsets are identical, the front drives on the "coast" side.
Coil sierras and Jimny's use a "high pinion" or "reverse rotation" front diff. (As much for tie rod clearance as the added strength)
A conventional gearset is about 20% weaker when used in the front. This is generally fine because there isn't as much load on the front end as the rear.
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