I dropped my car off at my independent BMW mechanic yesterday for a sound that I'd hear when turning at speed... over say 25 mph, you could hear a rotational noise turning right or left.
They had it all day and believe the sound is coming from the diff or TC. Tomorrow they are putting little microphones on it to confirm where the noise is coming from when the car is on the ground.
I have dealt with TC problems before, having blown one up after it developed a leak without me knowing... there were tons of threads on the internet about diagnosing and rebuilding TCs, but I have never heard anyone really talk about problems from front diff troubles.
Given that is mostly heard when turning, I would be surprised if it was the TC, given that only moderates front to back. In my head it wouldn't care about left to right (though I guess turning could place additional resistance on the drivetrain, forcing the TC to distribute the power front or rear, and that could be part of the noise)... what problems have people had with front diffs and what options might I have if they verdict comes back front diff?
They had it all day and believe the sound is coming from the diff or TC. Tomorrow they are putting little microphones on it to confirm where the noise is coming from when the car is on the ground.
I have dealt with TC problems before, having blown one up after it developed a leak without me knowing... there were tons of threads on the internet about diagnosing and rebuilding TCs, but I have never heard anyone really talk about problems from front diff troubles.
Given that is mostly heard when turning, I would be surprised if it was the TC, given that only moderates front to back. In my head it wouldn't care about left to right (though I guess turning could place additional resistance on the drivetrain, forcing the TC to distribute the power front or rear, and that could be part of the noise)... what problems have people had with front diffs and what options might I have if they verdict comes back front diff?
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