I have a 4×4 2000 ford explorer. When I put it in 4 wheel drive and turn a corner it whines really bad . I took it to 2 mechanics and they said they think it is ok. So I called the ford dealership and they said the same . What is you oppinion
The first thing that comes to mind is the outter u-joints on the front axle. There is also an inner u-joint on the right side. Have these checked out. They freeze up from rust and cause pressure on the front drive axle parts which can cause a whinning noise. This is common to all 4x4s’ that use u-joints no matter what make of vehicle.
Your 4wd system is noisy at any rode speeds, or while making any sort of turn due to the CV axle shafts binding. Keep it in 2wd and only use 4×4 if you think you need it.