Re: NG 900 Frame Rot - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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That may be too far gone to save it without getting a body shop involved to try to cut it out and weld in a clean donor. As soon as you can, you want to drop the rear axle to evaluate the situation under the bump stop, which you could replace while you're there. Dropping the axle is not too involved, much easier than the front suspension. However, jacking both sides of the back end of the car without a lift is a little tricky.
If you're lucky, you can scrape the worst of the rust away and get something like POR-15 on that to slow it down.
I had a 99 Viggen that got eaten up there and at the shock mounts in the wheel wells, so you'd best check those out as well. You can cut the hatch liner to get a look from inside. I got a cleaner '00 Viggen and monitor those spots, among others, and shoot Krown rust preventive in there when I can.
DIP's got some info under rear suspension about dropping the axle and accessing the shock mounts.
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