All you really need is obviously the transmission and bellhousing (it’s a two piece thing for the NV4500), clutch pedal assembly, clutch set, pilot bushing, slave cylinder, and to get rid of the automatic transmission controls a manual transmission equipped computer, unless there’s a different way of eliminating the controls.
But yes, having the 6.34:1 low gear in four wheel drive makes for some awesome crawling.
6.34:1 ratio was available in the 92-95 which is the aforementioned external slave cylinder, 96- up was 5.61:1 first gear and also an internal slave cylinder setup.
It really is plug and play, as I changed over from the NV3500 to the NV4500, only because I blew up three of the NV3500’s, I needed something stronger.