Here's where the noise could be coming from:
* Rear Shocks/Dampeners: While you mentioned new *struts* (front), did you replace the *shocks* in the rear? Worn-out rear shocks are a very common source of noise. They might be leaking or simply worn out internally, causing clunking, banging, or squeaking.
* Leaf Springs (if equipped): If your Lumina has leaf springs (more likely on lower trim levels or heavier duty models), they can become cracked, broken, or rusted. This can lead to significant noise. Inspect them carefully for damage.
* Bushings: Various bushings in the rear suspension (e.g., those connecting the control arms, leaf springs to the chassis, etc.) wear out over time. Worn bushings will create squeaking, creaking, or clunking noises, especially when going over bumps. These are often overlooked.
* Control Arms: The control arms themselves can develop worn bushings or even cracks.
* U-bolts (if applicable): These secure the leaf springs (if applicable) to the chassis. Loose or rusted U-bolts will cause significant noise.
* Exhaust System: A loose or damaged exhaust system can rattle against the undercarriage, mimicking suspension noise.
* Brake Components: Worn brake components, such as brake pads or calipers, can sometimes make noises that seem to be coming from the suspension.
Troubleshooting Steps:
1. Visual Inspection: Thoroughly inspect the entire rear suspension. Look for anything loose, broken, rusted, or worn. Pay close attention to the shocks, springs, bushings, control arms, U-bolts (if applicable), and exhaust system. Jack up the rear of the car safely and use jack stands.
2. Test for Movement: With the car jacked up, grab different suspension components and try to move them. Excessive play indicates worn parts.
3. Listen Carefully: Have someone slowly move the car up and down while you listen closely to pinpoint the source of the noise.
4. Professional Inspection: If you can't identify the problem, take your Lumina to a qualified mechanic. They have the experience and tools to diagnose the issue accurately.
It's crucial to address the noise promptly. Driving with a damaged suspension can be dangerous and lead to further damage. Remember, the issue is almost certainly *not* related to the front struts you replaced.
