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Re: Cummins swap excessive frame twist in neutral
That Cummins has a ton of rotating mass, and tons of torque. Revving it throws that weight around pretty quick, which is what is causing the rocking. A cucv frame should be able to handle it. My old Dodge was still just a c-channel frame and it made 398/1011 and I never had problems with the frame. Axles and transmissions yes, never the frame lol.
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