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Message: [QUOTE="Powerstroked162, post: 619566, member: 120"] It's no different really than what Craig and I put together in his 6.4. And just to be clear so lurking readers do not get confused, it most be a 4r100 modular case. IIRC Dustin is right that the transfer case input must still be swapped out in the later model superdutys. to the op: unless you are looking to make some quad digit power, I wouldn't suggest swapping to a 4r. Honestly with the 5r units available now, I doubt I could even see a reason to swap unless you were looking to build a drag truck and wanted full control of your trans without having to learn the 5r PCS. . [/QUOTE]

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