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I recently posted about this - no one seemed to have an answer so I took a closer look. Underneath the rear passenger seat area are two platforms against which the two spring seats press upward. These platforms extend out and towards the front the of the car. There is a 3/4 to 1/2 inch gap between these platforms and the body of the car at the rear seat area.
As the car ages or possibly experiences a very sudden jolt - these platforms rusty as they are, then bend toward the body of the car - causing the rear to sag the equivalent amount. I am bettng a lot of what people think are fatigued springs is in fact rear platform fatigue.
On mine only the pass side had fatigued so that it was bent towards the car body and touching it. Driver's side was fine.
Here is what I did - as a precaution on the drivers side I wedged a 1/2 inch block of wood between the platform and the body of the car.
On the pass side - the only way to bend back the platform to get something under there is to release the tension on the spring - which I haven't done. Instead I placed three twist inserts into the spring. If you use the donut inserts you need to lower the spring - that would be a good time to check the platforms.
I added one twist insert to the driver's side spring to balance firmness on both sides.
Now both sides have an equal and nice gap at the wheel well and rear sag is negligible. I've also noticed the car handles better with less sway and a firmer feel going over bumps.
I suggest getting a good flashlight, crawling under your car and checking the platforms.
posted by 209.197.1...
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