When is it necessary to replace the subframe?
2 Answers
If the vehicle has experienced significant undercarriage impacts or collision accidents resulting in deformation or damage to the subframe, then the subframe must be replaced. Below are the relevant details: 1. Subframe bushings: When installing subframe bushings, utilize the principle of thermal expansion and contraction for installation. Generally, if there is no significant gap in the subframe bushings, replacement is not necessary. Since the subframe represents the vehicle's safety system, it must not be taken lightly. 2. Ensure driving safety: The round holes for the bushings on the subframe will enlarge slightly with each bushing replacement. After several replacements, the holes may become larger than the bushings, creating a gap between the hole and the bushing. At this point, the subframe must be promptly replaced to ensure driving safety.
My most recent experience was hearing a loud thud when driving over a pothole. Upon inspection, I found the subframe was rusted and deformed, so it needed immediate replacement. After that incident, it got knocked out of alignment, and I always felt the car was unstable at high speeds. Later, the mechanic said severe deformation could affect steering stability and safety. Corrosion is a common issue with older cars, especially in areas where water accumulates on the chassis, leading to holes. If you spot cracks or deformation, replace the part decisively—otherwise, the suspension system could be compromised, making repairs more expensive and dangerous. Drying the chassis thoroughly after washing the car can help prevent such issues.
