vibration

[sawyer1]

This happens on my dads truck a 03 6.0l dually no mods and stock ride height when he takes off from a dead stop and 15,000 lb trailer it shakes the whole truck the only way to make this not happen is if he just takes off real slow is this normal or is something wrong. thanks

[sawyer1]

bump......

[Evil Eye]

Do either of these sound like they fit what you are describing?

2005-07 Bucking/Jerking when Towing:
Trucks that exhibit a bucking/jerking sensation at steady speeds in tow/haul when towing large/heavy gooseneck trailers that typically goes away when the accelerator is completely released or depressed fully, and does not occur when using the cruise control, may be caused by movement of the driver's foot after hitting a bump in the road or triansmission upshift in combination with the particular trailer load. There is a revised computer program to make the computer less sensitive to minute accelerator pedal inputs. If reprogramming does not resolve the issue, the problem may be due to the hitch, the trialer or the loading of the trailer. TSB #07-6-9.

Vibration/Hop at 40-48 MPH, Truucks with Trailer Hitch:
Some 2005-07 F-Super Duty trucks with long wheel base (over 156") may exhibit what is described as a hop on smooth or coarse road surfaces. Although Ford conciders this to be characteristic of trucks with a GVW of over 8500 pouns, some drivers may be more sensitive to the condition. There is a damper kit (P/N 5C3Z-5D008-A) available to correct the hop under the described conditions. It will not correct shimmy, harsh ride or vibration after hitting bumps. TSB #07-5-11.

[sawyer1]

possibly ill have to let him know that also can this be caused by the driveline not being balanced i know on my buddys truck it had a 6 inch lift and he would get shudder under acceleration?????? But this truck is stock really stock

[Evil Eye]

This is more appropriate to your condition:

99-07 Super Duty F-Series Two-Piece Driveshaft Shudder:
Some trucks may exhibit a vibration on moderate to heavy acceleration from a stop. This is usually due to too high of an angle through the center u-joint. The correct angle through the u-joint should be 0.5-3.0 degrees (compare front shaft angle to rear shaft). Check the engineering number of the center bearing bracket to ensure it is the correct application, and replace if necessary. If the bracket is correct, the shudder may be corrected by shimming the bearing down from the bracket using up to three 1/4" shims, part number E0TZ-4A209-A and two grade eight bolts long enough to expose three threads above the nut when tightened to 46 ft/lbs. Loctite is recommended. Broadcast Message 0518, 1475; TSB 04-22-7, 05-17-6, 06-23-4.