Hi I'm new to this site ,so please bear with me. I have 87 Sammy with a good rebuilt motor and I upgraded the transfer case to go with the 31"baja claws. The 4.16 transfer case with 2low split-H from Rocky Road works great but when in two wheel drive and cruising at 45 to 50 mph it makes a strange noise that sounds like the the four wheel gears and front shaft are still turning. what can this be?