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I guess Im not sure what a interaxle differential is, if you see the drivetrain on the youtube video previously mentioned you can see there is a differential on each axle
there is a I guess you could call it a transfer case between the front and rear axles except it is mounted above the tube...
for highway driving you just use the two rear axles for power. There is a selector to engage the front two offroad if you need it and there is a different selector to lock all 4 axles.
The center tube is totaly immersed in oil, it is not real easy to access inside it but you can take it apart...