Re: Manual Transmission 4th Gear Grinding Noise
It should be covered under warranty. As someone said above, it is a simple brass ring, but to replace it you must completely remove and tear apart the transmission. On a 3, this involves removing the engine as well, because there is no room in the engine bay to just remove the transmission. Therefore, you can expect your car to be out of commission for a few days to a couple weeks while they replace it. One thing you can try if you don't want to leave it in the dealer's hands for so long is replace the gearbox oil with a full synthetic. It won't stop the damage (it is usually progressive), but it will slow it down and possibly stop the grinding altogether, until the damage progresses more.
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2005 Sunlight Silver Metallic 3s