![]() BMW tried to fix this problem in the E46 by placing a cross member on the front two mounting points of the sub-frame. This constant loading and unloading weakens the sheet metal and causes it to fatigue and separate from the chassis. This happens because the rear differential transmits the torsional load from the engine through the sub-frame, then into the chassis. ![]() One of these problems is the rear mounting points for the sub-frame, which can rip out from their spots in the sheet metal. An unfortunate side effect of this is that the E46 also shares some of the same problems as the E36. The E46 rear drive-line and suspension are very similar to that of the E36 chassis. This is a common problem in all the e36 and e46 series, including the M3.
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