The six-speed manual transmission used in the Jeep Wrangler JK is the NSG370.
The NSG370 was fitted to the third-generation Wrangler from 2007 through 2018. It is a six-speed overdrive manual transmission associated with both the early 3.8-liter V6 and the later 3.6-liter Pentastar V6. The transmission was also used with certain diesel-powered JKs outside North America.
The name identifies the transmission family rather than a Wrangler trim. The JK’s automatic alternatives included the four-speed 42RLE in earlier years and the five-speed W5A580 after the 2012 powertrain update. That is why listings sometimes mention several transmissions for the same generation.
Common mix-ups involve the AX-15 and NV3550, which are five-speed manuals used in earlier Jeep applications, including older Wrangler generations. The NSG370 is the distinctive six-speed manual associated with the JK era.