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I have an '07 5.9L 2500, CTD, 48RE AT, Q-Cab long bed. I've had the truck 2 months, it has 2400 miles on it.
Under high load, low RPM situations, such as accelerating in OD (torque converter locked up), there is a vibration, I can feel it through the floor and even up through the steering wheel. Its most prevalent while hauling my camp trailer (~4500lbs). Sometimes its bad enough to rattle the dash.
If it's not a u-joint it may be that you need to shim your carrier bearing. Mine is a shortbed and I dont have one but I've read where more than a few guys with longbeds have had to shim it because it was off from the factory.
i haul alot of different stuff but i use a 40ft float my vibration isnt near as severe as your like shaking th dash but in first gear i feel it and 52-56 mph. i can feel it I have yet to solve that problem and another thing is I can only feel it loaded empty i dont feel a thing
A shudder under load usually indicates torque converter issues. Sounds like the lock up clutch is slipping. Mine used to shudder under acceleration until i changed out the atf and filter and added a good atf+4 fluid and the shudder went away. Again mine is a 99 not an 07 but thought i would see if i could help. Have you checked the tranny fluid? just because it is new doesnt mean its full. Also check for the color of the fluid it should be bright red and not smell burned. If it is low on fluid it would possible cause the shudder also.
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