Ok so I was in my friend's Jeep earlier today and I noticed that his 4x4 options seemed a lot more inclusive than mine/ours. His T-case shifter had a 2wd, part-time 4x4, full time 4x4, neutral, and 4x4 low. Assuming that part-time 4x4 is comparable to our AWD system, why do they have so many...