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I had a 77 911 turbo carrera, i had about 70 or 80k miles on it when i put on the new suspension. The first night I had it on I tore off the rear sway bar mount clean off the body pulling in a driveway. Now in all fairness, I had never replaced the rear body mounts for the sway bars, and that failure is nothing new for 911s, plus I was running 31mm adjustable f&R bars from SmartRacing. I tracked the car a handful of times and it was an everyday driver for me, I had 425/ 550 lbs springs front and rear. It was a pretty aggresive setup for mainly street use.
None the less, the rear should be shored up. youre putting all of the force upwards onto the shock towers, taking it from the rear torsion bar tube. have you looked close at them? all they are is a stamped steel cup thats sot welded to the top and the cross box is spot welded to the rear engine rails. Problem is everythig is undercoated and shutzed back there so its tough to see any sign of failure. you see all the old racecars 934s, 935s rsrs etc had gussets on that mount. If it were me, Id run a weld around that seam on the cap, gusset it, and add plates to the ends of the cross mount. Mines literally tore off when i hit an expansion joint. The ass of the car just dropped.... and it was a mess to clean up and get straightened out so i could weld it back. I alos had seen one or two cars that I had workied on where the top caps on the rear shock towers were starting to peel off.
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