Cummins swap excessive frame twist in neutral

[Krwright]

Fired my cummins up for the first time yesterday. The motor is very healthy but The cab shakes at minimum 3" while reving in park. It's a 1 1/4 cucv frame and springs. Anyone else Notice excessive shaking on their swaps? I have a video of it rocking while reving but don't know how to post it. It is quite extreme everybody that see's it say the same thing "holy ****". It just makes me think what will happen when pulling on something
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