Update. We got more snow. No 4x4, only 4x2 at the moment. I checked both hubs, they both lock to the axle. I gotta find out if the transfer case or the front diff is boogered up. I don't really have the facilities to jack the entire car, both axles off the ground. Nothing is visibly broken, cracked, leaking, etc. No noise comes from the front end or the TC when 4 wheel drive is engaged in Hi or Low. TC does engage, the gears, I just can't check if TC is outputting power to the front wheels. Any recommendations on a shade-tree method for determining if it's the front diff or the TC???