I have a 2014 SC with 70,000 KM. I just had a bunch of work done on it with some nagging knocks and it is unbelievably tight up there now....perfect in fact. They also replaced my front differential and now it is so quiet, I hear what appears to be a fan noise or light ticking when driving at 50KM (30 mph)...like a 4 cyl motor and not characteristic of a 500 HP V8. Dealer says it is a clutch fan during cold weather that is a characteristic across all SC Vs...and well I am not sure. Does your V8 sound like a small 4 Cyl - or a fan with a slight tick at low speeds?