What is the difference between the:
G56
NV-5600
5600

 

From another list I'm on, posted by one of the mods 3 weeks ago: "The G56 is a medium-truck 6-speed manual, designed and built by DaimlerChrysler for Mercedes and Freightliner medium duty trucks in
various parts of the globe. The most noticeable change between the G56 and the NV5600 is the lower gear ratios, especially overdrive. This may cost you a few miles of highway range per tank. The G56 has been in production for about 2 years prior to Ram use, and DC is confident that it will stand up in Ram use."

The G56 also has a dual mass flywheel, instead of as single larger plate. Since this post, the G56's have been put on restriction as you've probably read here. Rumors have mentioned a couple of possible reasons, which you've probably also read on DTR. You know how it goes with new things....it can take a while to get the bugs out.