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Were looking at two distinct weak links in both Ford and GM's heavyweights.
Ford's weak link is rubber, a 305 (or 315 with relocated sway brackets) would help but thick rubber isn't a cure all. Before you just say "Just throw some 305 PS2's or PZero's on there" it sometimes isn't that easy, it depends on what kind of production/racing support Goodyear provides Ford. Thick rubber good, Rubber compound better, it is being whispered that the GT500/SVT Cobra will use Pirelli's and that makes sense over the PS2's because Ford has a current deal with Pirelli. Sadly, there is no 315 in a PZero unless they go Rosso but it is a heavy tire and the treadwear rating is shit.
GM looks like they are in a transmission dilemma more than anything (some would argue weight) but unless they can convince Tremec to warranty a 560 torque rated transmission on an engine producing close to 625, I don't see the MG9 making it. The MH3 will bolt right up to the LSA though but that is the LS9 transmission. A good engine is not a problem, rear end? not a problem, Traction? New Goodyears could be scary but with 305's, 220 treadwear rating and the IRS that saps up some initial torque... Not a problem... The transmission is a problem, not because it can't handle it, but because its hard to convince a 3rd party supplier to fulfill warranty vouchers when Tremec obviously warns GM not to exceed that specific rating...
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