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After only 900 miles, my 2008 GranTurismo has developed a howl from the rear end. It starts at about 70-74 mph, gets really pronounced at 75-76 mph, then fades out competely by 80 mph. Only happens on the freeway after a 75-80 mile run on back-country roads (spirited but not hard driving).
I took it in to the dealer's service dept. after a run yesterday. The shop foreman and I took it out. He thought the sound was coming from the differential, and I left the car with them.
Today the service manager called, saying the differential is their prime suspect. They'd checked the oil in it, which was discolored and seemed burnt, but it wasn't low. It's a special type they have to order and won't be in for a couple of days. Then they'll replace the oil, drive the car and see what happens.
So far they don't have a theory on what the problem is. I'd appreciate any thoughts on it.
I took it in to the dealer's service dept. after a run yesterday. The shop foreman and I took it out. He thought the sound was coming from the differential, and I left the car with them.
Today the service manager called, saying the differential is their prime suspect. They'd checked the oil in it, which was discolored and seemed burnt, but it wasn't low. It's a special type they have to order and won't be in for a couple of days. Then they'll replace the oil, drive the car and see what happens.
So far they don't have a theory on what the problem is. I'd appreciate any thoughts on it.