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'71 Rear Torsion tube rot

Suspension

Vehicle Information: Model: 911; Year: 1971; Body Type: Coupe; Engine (type, size, modifications): 3.0 w/backdated exhaust; Total Mileage: ?!Ha?! NO one knows the answer to this question!;

Hello!I was replacing the torsion bars and bushings in the back of my car and as I looked inside the torsion tube crossmember I found a pile of rusty scale. I quickly vacuumed this out- and then I saw daylight! This thing is so seriously pitted that it rusted right through and I will replace it. Since Porsche was kind enough to build the same car for 25 years and it is easy to upgrade pieces in the car as I repair/replace bits I have a few questions:1. I understand that the later cars have aluminum banana arms with slightly different anchoring/pivot points. It would appear that if I am to replace the torsion tube anyway, it should be possible to replace both the tube and the trailing arms with ones from a later car. Is this correct?2. If that upgrade solution would work does that necessitate shock, stub axle, bearing or other component replacement also even if those parts in my car are healthy right now?3. I live in RI- any good hints on a source for a used rear suspension that is closer than Arizona or California?I was surprised to have looked through my entire collection of Up-fixin and also this site and not found this topic. I can''t imagine I have the only rusty torsion bar tube in the country in the last 30 years!Thanks for your time. I have a limited budget for this car but I do look forward to saving it.Bob

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