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The upper seats against which the suspension springs press, I mean. Let me explain. A year or so ago I reported that the passenger's side of my 900 was sagging noticeably - bad enough that with a passenger in the back the wheel would scrape the well going over bumps. Most people on this board have experienced something similar but usually attribute it to weak or old springs.
Maybe not. In my case, the upper "seat" against which the spring presses had become corroded over time and in its weakened state had bent upward with only the body preventing it from going further. I had put off fixing it until now (as a precaution I wedged a block behind the driver's side which was still intact). This weekend I removed the spring as per Bentley and went to work repairing the seat.
Its an interesting but in my view faulty design. In order to allow the shock to move freely through the shock tower, the seat is attached at only one point to the body of the car - allowing spring pressure, and in my case, rust to bend the seat upwards - causing the car's rear to sag over time. I repaired the seat with fibreglass (a lot I might add - welding might be better) and wedged a 1/2" block behind the seat as a precaution. It seems pretty sturdy now. I also fabricated a delrin (cutting board) insert that could fit under the lower rubber spring support. Now the car has no noticeable sag at all, no clunks of the rear and midship mudflaps, no nose projecting upwards and most importantly no scraping of the wheel well going over bumps.
My advice - when you have a moment crawl under your car and check the integrity of the springs seats. My guess is that a lot of what people think is sag due to weak springs is probably weakening or broken seats.
posted by 24.139.16...
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