Hi all, I've had my '01 Z71 for about a year now. It's my first 4x4 vehicle I've owned and haven't used the 4 wheel drive at all. It's an electronic transfer case and I've only turned it on a handful of times just for grins on paved roads. It seems to be working fine but was just wondering if 4X4 vehicles need routine preventative maintenance just to keep it in good working order if you're not offroading very often. Like changing out seals and gaskets or whatever or lubrication requirements??