NSG370 6 Speed in the new TJ

I was looking at the specs for the new TJ with the 6 Speed.. It says that it has a NSG370.. Who is the manufacturer of the 6 speed? The cool thing from what I have read is.. 1st gear is 5.014:1 which is almost like the NV4500.. But I doubt it has the durablility of the NV4500...

Ben