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Just a guess that the bushings were not allowing enough rotational flex or actual twisting, so the torque was transferred to the casing and mount, which eventually fatigued
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Emery
1988 930 coupe - Silver Metallic
TurboKraft 3.3L 8:1 CR, SuperSC Cams, GT35R, B&B Headers, TK intercooler, Tial WG, ARP, tecGT based phased sequential EFI & ignition, Wevo shifter/coupler, ... 
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