I happened to look at my sticker yesterday and saw no G80, I always assumed G80. Deciding to look up all the codes I found:
GU6 Axle Rear 3.42 Ratio
YD3 Differential, driver selectable rear locker
I'm assuming this now tells me stay on the pavement and gravel roads, and as mentioned by Roadie in another G-80 thread my configuration may need more assistance then the 2wd with G-80?