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Honestly? I'd keep the Th400 and add a Gear Vendors OD unit to it. For the cost of that and driveshaft modifications, it'll still be cheaper than building up a 200R4 or 700R4 to the point of being able to withstand the torque of the 454, and you'll still have what is, in my opinion, a superior transmission to both of the R4s.Swapping in an electronic 4L80E into a mechanically controlled setup isn't the most feasible of options.

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9y ago

What else can I help you with?