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2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
It's either DLD, or the DHD. DHD has pto opening on the passenger side, and besides wider chain and maybe (can't remember) bigger bearings, they are the same.
The NV241HD, an option on Ram 2500's and standard on Ram 3500's built after 1998, has a stronger case and wider drive chain to better withstand the shock of snow plow service, a PTO cover and drive gear, and an extra bearing to support the thrust to the main shaft created by a PTO adapter.
Except for dimensional differences and the PTO port on the NV241HD, all of the cases are almost identical in appearance.