Here's a breakdown of potential problems:
* Incorrect Installation: The conversion kit's components (springs, shocks, mounting brackets, etc.) might not be installed correctly. Even a slight misalignment can dramatically affect handling and lead to swaying. This is the most probable cause.
* Faulty Conversion Kit Parts: The shocks or springs themselves might be defective, worn, or of poor quality. This is less likely if it's a reputable brand, but still possible.
* Incorrect Spring Rate: The replacement springs might have an incorrect spring rate for the vehicle's weight, leading to instability.
* Damaged or Worn Parts (Beyond the Conversion Kit): While less likely, the sway bars, bushings, ball joints, or other suspension components could be damaged or worn, exacerbating the swaying problem. The conversion might have highlighted pre-existing issues.
* Improper Weight Distribution: If heavy items are consistently carried in the rear, this could affect stability, especially with a different suspension setup.
What to do:
1. Return to the installer: If the conversion was recently done by a shop, immediately contact them and describe the problem. They should diagnose and fix the issue as part of their warranty.
2. Thorough Inspection: Have a qualified mechanic inspect the entire rear suspension system, including the conversion kit's installation, all related components, and the alignment. They should check for loose bolts, damaged parts, and improper alignment.
3. Alignment Check: A wheel alignment is crucial after any suspension work. Misalignment can significantly contribute to swaying.
In short: The swaying is almost certainly related to the air suspension conversion. Professional inspection and possibly re-installation are needed to address the problem. Don't continue driving the vehicle like this as it's unsafe.
