Q: Frame/Subframe

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What causes a rear subframe to become kinked/bent? Rear end collision ..? Anything else ?
My car has an automatic transmission.

The sub-frame or frame can get bent by hitting a curb, rear end collision, or hitting something large in the road. There are not too many things that can bend it. I have seen a few get damaged by a tow truck that tightened the cables too much. Other than that, I cannot think of any other possibilities for this issue.

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