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Please forgive my ignorance. What are the advantages of the on-demand sprag? Logic would suggest that 100% engagement of all axles at all times would be more beneficial.

So, if I am understanding these large transfer cases: 800 series are sprag 900 series are air-engaged-front like the Oshkosh HEMTT TC's Either one should be able to handle the 600-1000 ft-lbs produced by the 8.3C Cummins. The HEMTT is just an Oshkosh55000 like found in many civilian heavy...

Is there only one type of 5 ton transfer case? Just curious. I need a TC capable of handling the torque from a Cummins 8.3L. Do the regular sprag type 5 ton cases split the power 50/50 or is it torque sensing, only engaging the front when the rears slip? Thanks.