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it depends whether the centre Diff is an open Diff or a Viscous Diff
and open Diff gives a 50/50 split -- a Viscous diff will have a loading set which splits the drive according to how the diff is set -- I think it follows then that the DCCD, just allows the driver to alter the preset split -- on a non DCCD the diff is set at the factory and cant be changed without changing the diff itself