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mc 2150 crank case vent
I would start with checking the motor mounts, transmission mount and the transmission torque arm.
I can only guess from your description, but it appears to me that something big is moving around, but only under load.
When I had a broken motor mount, I could -- with the hood opened -- see the engine rotate way over when I started off from a dead stop.
Made big-time banging sounds and would shake the entire Jeep as the engine would rotate over and sort of oscillate until the Jeep was moving.
Just a guess, but hoping it helps.
Regards,
Gadget
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