This kit will save time when repairing the chassis, and is also strongly recommended as part of preventative maintenance. Has anyone here had rear subframe issues Post by GP20 » Thu 4:03 am. Turner accomplishes this by thickening the metal and distributing the load over a larger area. This product reinforces the chassis sheet metal at the subframe mounting points. The Turner Motorsport reinforcement kit has proven over and over again to be effective and the easiest to work with in the long run. It can also make any additional work there harder and almost impossible to weld against. The other possibility, and this is the one that scares me the most and has been common on the E46, you might have a subframe issue. If the guibo is bad you will be able to see it starting to shred. This seems to work but that does not address the issues of the spot welds failing on the sheetmetal. It sounds like you might have a bad guibo (flex disc) or possibly a dried CV joint. BMW has also tried to prevent the issue by injecting foam into the open space between the underside of the chassis and the top of the trunk. This is where Turner Motorsport has witnessed many failures of the chassis on low mileage street cars and race cars. The unfortunate side effect of this is that the load from the front of the subframe now gets transmitted to the left rear of the subframe. This cross member keeps the front mounting points from having problems by placing the bushing and the stud in double-sheer, thus reducing the twisting action on the sheet metal. BMW tried to fix this problem in the E46 by placing a cross member on the front two mounting points of the subframe.
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 subframe, then into the chassis. Essentially, the rear end of the car starts to disconnect from the car. The suit originated in 2006 and claimed that defects in E46 3-series models cause. This is known to happen on E46's because the thickness of the mounts are too thin. The particular model in question is the E46, and covers the complete model run from 1999 through to 2006. What happens is the actual mounts for the subframe tear from the unibody. One of these problems is the rear mounting points for the subframe, which can rip out from their spots in the sheet metal. There's really no guideline to replace the subframe bushings, but subframe failure on the E46 is ultra common. An unfortunate side effect of this is that the E46 also shares some of the same problems as the E36. The E46 rear driveline and suspension are very similar to that of the E36. Still the same quality you're used to, but now offering additional surface area for the ultimate in reinforcement. UPDATED 2020 for additional reinforcement.
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