Dodge uses a hybrid rear axle on the Ram 2500HD and 3500 equipped with the V10 or Cummins diesel engines. This combination uses Dana 70 axles shafts mated to a Dana 80 center section (including the carrier, ring gear, and housing). While the Dana 70 carrier is the same size as the one used in the Dana 80, the Dana 70 carrier is a multipiece design, while the Dana 80 uses a stronger one-piece unit. The Dana 70 and Dana 80 also utilize a different size bolt to retain the ring gear to the carrier. These are serious one-ton axles for heavy duty one-ton trucks and the locker that you use in them has to be heavy duty too - this is not the little LockRight you would see in a Dana 30 - this beefy locker weighs in at a hefty thirteen pounds all by itself.
Its a lot generalized, but it is more/less correct...
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