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Old 07-04-2007, 07:26 PM   #1 (permalink)
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vibration under load?

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.

Is this normal? Any ideas?
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Old 07-04-2007, 07:39 PM   #2 (permalink)
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Vibration that is felt though out the truck enough to vibrate the dash is not normal . Sounds like a drive line vibration. Binding u-joint or pinion bearing .
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Old 07-05-2007, 12:16 AM   #3 (permalink)
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Sounds to me like you're lugging the engine. With the low end torque these bad boys put out, that's not real good for the drivetrain. Try downshifting to increase your rpm's.
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Old 07-05-2007, 01:09 AM   #4 (permalink)
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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.
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Old 07-05-2007, 04:55 AM   #5 (permalink)
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i feel it too

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
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Old 07-05-2007, 07:52 AM   #6 (permalink)
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you guys running stock torque converters?
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Old 07-09-2007, 06:01 PM   #7 (permalink)
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Yes, stock TC.
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Old 07-09-2007, 06:17 PM   #8 (permalink)
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Have that Tc check i have a 99 and i had the same problem but once i had a new tc put in it was fine
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Old 07-09-2007, 08:31 PM   #9 (permalink)
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If it makes any difference, its not a steady vibration, but instead its a pulsating vibration.

I think I might call the dealer this week.
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Old 07-09-2007, 09:28 PM   #10 (permalink)
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How low of rpm are you talking about?
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Old 07-09-2007, 09:43 PM   #11 (permalink)
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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.

John:thumbsup
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Old 07-09-2007, 09:50 PM   #12 (permalink)
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My crap factory TC gets replaced tomorrow, only shudders in OD when the RPMs get close to 2K. Been driving at 55 only for over a week.
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