Mine came stock w/3.23’s. They were replaced w/3.55’s, still a factory gear ratio, though I’m not sure if it was a checkable box in the old days, it was a standard gear in the Durango in ‘98.
The 2.71 year set was certainly available for those long distance travels. A most helpful ratio for the Hwy. traveler. The don’t know how prevalent they were.
At least you can still get Suregrips and some decent ring and pinion gears for them.