Question about 2006 Ford F-150

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Rattling under load only. Front end. Seems to be under the passenger side. It stops when 4wd is engaged.

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Rattle is usually a bad shock, or loose attachment on frame rail . look around pass side frame rail, check sway bar bushings also, see if u can wiggle upper shock cover .

Posted on Mar 17, 2011


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Does the driveshaft for the front wheels turn when in 4wd? The actuater might work but the diff lock for the front wheels might have broken. If the front driveshaft does not turn when in 4wd, the transfer case might be the problem.

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I got a 1997 gmc jimmy 4wd my 4wd doesnt engage the front diff but it engages the ****** for low range ive checked my actuator pump and its moving but now i have a rattling noise in my front drivers side...

It would appear you have a failed CV shaft on your drivers side front. If the axle is jumping around, that means the 4wd is engaged, but the front wheels can't pull because the one axle is just freewheeling. Replace that left axle and you should be good to go. Might want to check the cv boots on the right side axle while you are there.

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I have a 1999 dodge 1/2 ton 4x4 when I pull it into 4wd the front end does not engage and the indicator light doesn't come on

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Mar 11, 2011 | 1998 Dodge Ram 1500 4WD

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There is a horrible rattling noise in the front end of our 03 gmc yukon xl. i think the 4wd linkage is broken.

It sounds more like a possibly bad CV joint in an axle shaft or internal differential problem. There is no mechanical linkage to the front axle, its all electronically controlled. The front suspension is pretty good there aren't a lot of rattle type noises created from it. I need more info to diagnose better. Does it do it only moving? or stopped? over bumps only? in 4wd only? while turning? certain gears or speed only?

Jan 27, 2011 | 2008 GMC Yukon Xl 4WD

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4 wheel drive service light came on seems like front wheels are not engageing, i feel it shifting like its in gear but i dont have the traction what should i look for?

It's pretty basic actually. The encoder motor engages 4WD within the transfer case which drives the front differential. The drivers side wheel is always engaged at this point and the passengers side wheel is engaged via a vacuum controlled cable (actuator - lunder the battery). There are no "hubs" (so-to-speak), not in the way that you use to see on the older systems where you'd have to lock them.

Dec 27, 2010 | 2002 GMC Yukon XL

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2004 F150: When in 2wd the front end makes a noise like a rat...

I had this problem too. It could be a few different things but all the same result, loss of vacuum causing the 4wd to start to engage but not completely. The teeth on the clutch in the locking hub are grinding on the spline of the cv shaft as you lose vacuum and it tries to go into 4wd which is the default if everything would fail. 1st thing could be either of the 4wd locking hubs (approx $200 ea., located on the back side of each front spindle), check them to make sure the vacuum lines on the top of it are still attached these require the brakes, tie rod and upper ball joint to be removed if replacing, 2nd is the 4wd vacuum actuator (approx. $40 located on the firewall passenger side behind the battery) Ford has replaced this part with a modified one that has a little roof on it to stop the water that drips of the hood when it rains and makes it short out, this is very easy to replace (2 nuts) and last if both the above are working just fine would be to trace all the vacuum lines for a break unfortunately it is a 6-8 foot line for all the front 4wd and it costs approx. $100 if you have to replace. Not very difficult just time consuming. Hope some or all of this helps.

May 14, 2010 | 2004 Ford F150

1 Answer

05 f150 4wd will not always engage

There are issues with the 4x4 system I.w.e ends ingesting moisture/water into vacuum actuation system causing no 4x4 or ratcheting outboard I.w.e ends. (Even if you don't go 4x4'n ) pull off vacuum hoses @ I.w.e ends and check for moisture/water/rust also the I.w.e is not part of the wheel bearing itself It is the part on the axle side (inboard) of the spindle. (EVEN DEALERS CAT LISTED WRONG)Many shops just replace the wheel bearing side this may fix the symptom but not the true cause of damaged I.w.e. ! Check with a reputable dealer they should have info on this condition and repair procedure.

The integrated wheel end (IWE) system contains the following:

Vacuum reservoir
IWE solenoid
IWEs (spring loaded vacuum hubs)
Vacuum hoses
Check valve
The IWE system uses vacuum hubs that engage the front wheel hubs to the front half shafts or disengage the front wheel hubs from the front half shafts.

The IWE solenoid receives engine vacuum from the vacuum reservoir.

When the 4-wheel drive system is in 2WD mode, the 4x4 module (PCM)supplies a ground path to the IWE solenoid to apply vacuum to the integrated wheel ends (disengaging the front hubs from the front half-shafts). In 4WD mode, the 4x4 module (PCM) does not supply the ground path to the IWE solenoid, vacuum is not applied to the integrated wheel ends and an internal spring keeps the front hubs engaged to the front half-shafts.

Jan 24, 2010 | 2005 Ford F-150

2 Answers

94 4Runner 4WD Question

1. I would suggest that you engage your 4WD while you are in full stop and/or safe range of 5mph, however as claimed by the local dealers your vehicle is capable of engaging even while driving. Engage your 4WD while moving only when necessity requires.
2. That clicking noise while turning extreme right or left would be the birfield of your axle and would only mean your front hub is still engage even though you have disengaged transfer case.
Have your front hubs cleaned of old lubricants or grease due to non usage. dont use grease as lubricants, use thick oil such as gear oil or silicone oil. and use your 4WD every now and then.

Do this first then check if you still feel somtehing is loose on your suspension and others.

Dec 10, 2008 | 1994 Toyota 4Runner

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