How can I control axle wrap on '04/04 X during hard acceleration?
When I put my foot into my '04/'04 X I get a driveline vibration in first gear at 2800 rpm's until it shifts into second. I am talking foot to the floor WOT acceleration. The vibration only occurs under the load of heavy acceleration and appears to be caused by the change in the angle of my rear driveshaft rear u-joint due to axle wrap. I hung my camcorder from the frame and did a few passes to verify that the pinion was moving upwards on heavy acceleration. It looks like it even goes beyond the point of being "straight" to create an angle in the other direction.
Looking at these new X's it seems obvious that Ford has had to work out vibration issues. The rear driveshaft on a 6.0 X has a large vibration damper on it that the V-10 X's do not nor do any of the SD's (PSD or gas). Also the angle of the rear u-joint on a PSD X is noticably greater than a V-10 X. Seems that this was done to start the pinion a little lower knowing it will move up due to axle wrap with the PSD.
Hope these details haven't bored anyone. My real question is:
What can I do to an '04/'04 PSD X to reduce axle wrap under heavy acceleration?
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04/04 PSD X 4X4, Oxford White EB, October '03 build, all options except 2nd row captain's chairs and chrome step tubes, stock drivetrain, no flashes (still have quiet idle and original tow/haul), Donahoe 4.5" Spring Hanger Lift, High Angle Driveline CV Driveshaft, American Racing 17X9 Chrome Chamber Rims, Toyo 35X12.5R17 Open Country M/T's, PSD Badges, Yakima MegaWarrior roof rack with extension and King Cobra bike carriers mounted outboard, AMP Research Power Retracting Running Boards, Brakesmart Controller, Radius Rods, Firestone air springs with on board compressor, C-Bet'r mirrors, Marinco block heater plug in front bumper. Towing 28 ft. Sunline TT with slide room (7500#).
2001 Dodge RAM 1500 Quad Cab, Intense Blue/Silver two-tone, 4X4, 360, auto, 4.10 gears, Off Road Package, Daystar 2" front lift, 285/75R17 MT/R's, K&N Intake, Gibson stainless cat back, Line X spray in bed liner, Firestone air bags w/ on board compressor. Boss 7'6" plow.
Re: How can I control axle wrap on '04/04 X during hard acceleration?
Make some trick traction bars. Chrome or aluminium. Thats the only way. I would probably stay away from the WOT jump starts, your tranny is vibrating its inerds the same as the axle. In 40,000 I have never done that. [img]/ubbthreads/images/graemlins/shocked.gif[/img]
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Some people are like Slinkys. They are good for nothing but still put a smile on your face when you push them down a flight of stairs. 2003 X Limited Ultimate, Mineral Grey Metalic. DVD, Limited Slip, Badged, Cab Lights, Magnaflow, Thule Rack, 3" Lift, T Prodigy, Air Bags, Edge Programer, XM Radio, Extreme sound system. 315/70/17s on AR Chrome/Aluminium.http://community.webshots.com/user/stellinm
Re: How can I control axle wrap on '04/04 X during hard acceleration?
Don't you already have those spring leafs with snubbers that extend forward and act like traction bars? If so, you might consider shimming up the snubbers so that they contact the front of the leaf springs sooner, or with more force. Dale
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7.3 Excursion, it's a diesel thing.
Chicago MOB member.
Re: How can I control axle wrap on '04/04 X during hard acceleration?
He should have those but since they are not attached to the frame they still twist with the axle. They should help a little and I know Traction Bars are goofy looking but they work. Give this a try, maybe it will solve the problem.
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Some people are like Slinkys. They are good for nothing but still put a smile on your face when you push them down a flight of stairs. 2003 X Limited Ultimate, Mineral Grey Metalic. DVD, Limited Slip, Badged, Cab Lights, Magnaflow, Thule Rack, 3" Lift, T Prodigy, Air Bags, Edge Programer, XM Radio, Extreme sound system. 315/70/17s on AR Chrome/Aluminium.http://community.webshots.com/user/stellinm
Re: How can I control axle wrap on '04/04 X during hard acceleration?
The problems with traction bars is that they are a straight line solution, that causes problems when the vehicle leans, or one side goes over a bump.
The axle housing is twisted like a swaybar, and the axle housing is not designed to have twist on it!
This particular vehicle may have an improperly manufactured rear axle, or a fault with the spring and the built-in anti-wrap leafs, or a fault in the driveshaft/u-joints. It does not seem to be a known problem with the 4x4 Excursions until they are lifted.
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2000 Excursion Limited born 11/99 4x4 Toreador Red ext./gray int. 7.3PSD, 3.73LS, Skidplates, Pwr/Htd TeleMirrors, 6CDchanger, HtdBuckets, LT265/75R16E Bridgestone Dueler A/T Revo, Ford Wraparound deflector, PSDV8 badging, RoofMarkerLights, Tekonsha Sentinel brake cntrlr, PCM=AXD0, Edge Evolution II, WalkerBigTruck Muffler, RS9000, RS5410, Performance Friction 2 piece rotors/pads, Sylvania SilverStars, Landyot Gen III, Air Lift rear air bag system, Amsoil from MAXoil.com in diffs/trans/transfer 251k miles.
Re: How can I control axle wrap on '04/04 X during hard acceleration?
ExPSD, I did not think to ask if this is a high hp motor or what you are doing to cause the axle to twist. If it is stock there is a problem. I don't have any weird things happen when I fuel it.
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Some people are like Slinkys. They are good for nothing but still put a smile on your face when you push them down a flight of stairs. 2003 X Limited Ultimate, Mineral Grey Metalic. DVD, Limited Slip, Badged, Cab Lights, Magnaflow, Thule Rack, 3" Lift, T Prodigy, Air Bags, Edge Programer, XM Radio, Extreme sound system. 315/70/17s on AR Chrome/Aluminium.http://community.webshots.com/user/stellinm
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