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Biggest reason I would do 3.91 would be if I was using the factory AAM gearset which is known to be pretty quiet. If going aftermarket, 4.10 is even better if you are not constantly spinning the tires.
The vert is about 500whp with a 3.91 and it would light up the old Goodyear 305s at 50ish. Put on a new set of Pirellis (220 treadwear) and doing much better, but it will still light the tires from a launch. Hope that helps.
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2010 SS - Kind of an On3 kit, CTR 78/80, CompCam 239/251 620/632 122+4, E85, Z28 suspension and ZL1 diff with Outlaw axles. Gen6 ZL1 brakes.
2011 Vert - 416/w 230/236 .612/.602 115lsa, 1LE suspension w/32mm rear bar. Z28 diff. Gen6 ZL1 brakes.
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