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Where did you find the torque ratings. A 760 uses them and weighs 5026 empty with 550FTLB's of torque. With a first gear of 4.71-1 they should be good for at least 2600FLTB's of torque............. Even the lowly 3 series with 200FTLB's and a 4.32-1 should be good for 900..........
Are you SURE the ratios stated are first gear? Aren't they rear end ratios?
Had an engineer suggest using titanium for the spider.