440 for my RamCharger

Any difference in the t-cases besides the slightly different low-range ratio? I thought RC's always came full-time from the factory but a quick search shows I'm wrong, maybe I'm thinking of Power Wagons?
Maybe it was the 70s RCs that were all full time?
I think the only difference in the 208 and 241 is the low ratio. But I haven’t looked into it much yet