4wd issue
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4wd issue
I have a 2004 ford expedition 5.4l with the LSD axles. I havent owned the truck for to long, and living in the north east decided to test the 4wd the other day. I noticed when I put the truck in 4wd there was a humming coming from the front and the truck wants to pull to the right (fairly hard). Alignment is relative good when in 2wd. So I decided to change the differential fluid and trasnfer case fluid to see if this fixed the issue. Changed the fluid and it is still making the same noise and pulling. Also this time when I checked i rolled my window down and was able to hear a fairly loud clicking noise when going over 5is. The clicking didnt seem to increase (or if it did not by much with speed) Only went down the street like this and switched back to 2wd and the noise is gone.
Has anyone experience this issue? possibly fixes? I didn't notice any damage to the differential or metal chunks when I had the cover off. Does this system use a seperate vacuum line for each hub/axle?
Has anyone experience this issue? possibly fixes? I didn't notice any damage to the differential or metal chunks when I had the cover off. Does this system use a seperate vacuum line for each hub/axle?
Logistics Pro
Joined: Jan 2001
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From: Central NYS
If it tries to turn to the right when in 4x4 and under load, it sounds like the left front IWE is engaging and the right front IWE is not fully engaged. The teeth may be worn down or you may have a vacuum issue which is not fully engaging the IWE.
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THis is starting to make sense, and I believe my u joints for the front drive shaft may be on there way out also ( the clicking). Im in the north east and the truck is super rusty, but its a 100k mile truck in good shape outside of the rust issue that i got for $500 so i cant complain haha
Laughing Gas
Joined: Feb 2003
Posts: 877
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From: South Florida
Yes, there is ONE control solenoid behind the battery on the firewall, and an actuator ring on each front hub. When vacuum is taken away from the actuator ring the hub engages. So if you parked your truck on the ice or snow in 4x4 mode and turn the engine off the front hubs will stay engaged to help hold the truck in place.
Ford's 4x4 Front Hub Control Solenoid on Firewall ....
Ford Front Hub Actuator Ring .....
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Logistics Pro
Joined: Jan 2001
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From: Central NYS
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Other quick question - Looking on rock auto there appears to be 4wd actuator, 4wd actuator valve, and 4wd hub locking solenoid which all look the same thats in the picture. Are these interchangable names or actually different parts?
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Laughing Gas
Joined: Feb 2003
Posts: 877
Likes: 27
From: South Florida
Yes, Rock Auto lists the same part in several places by different name.
I always cross reference the Ford part number ( you can search for it on FordPartsGiant or Tasca or some of the other Ford parts suppliers online....).
What kind of issues are you having with your 4x4 system ?
Motorcraft CX2046 Vacuum Control Solenoid at Rock Auto
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I always cross reference the Ford part number ( you can search for it on FordPartsGiant or Tasca or some of the other Ford parts suppliers online....).
What kind of issues are you having with your 4x4 system ?
Motorcraft CX2046 Vacuum Control Solenoid at Rock Auto
.
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Thread Starter
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New User
Joined: Dec 2021
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Yes, Rock Auto lists the same part in several places by different name.
I always cross reference the Ford part number ( you can search for it on FordPartsGiant or Tasca or some of the other Ford parts suppliers online....).
What kind of issues are you having with your 4x4 system ?
Motorcraft CX2046 Vacuum Control Solenoid at Rock Auto
Ford OEM 4x4 Front Hub Actuator on Amazon
.
I always cross reference the Ford part number ( you can search for it on FordPartsGiant or Tasca or some of the other Ford parts suppliers online....).
What kind of issues are you having with your 4x4 system ?
Motorcraft CX2046 Vacuum Control Solenoid at Rock Auto
Ford OEM 4x4 Front Hub Actuator on Amazon
.
Im getting vibration / whirring noise in 2wd, and grinding/whirring is even louder in 4x4. I replaced the bearings about a month ago. Truck also pulls to the right fairly hard when in 4x4. So im thinking maybe the hub isnt fully disengaging / engaging
Did front diff and tc fluid.
Laughing Gas
Joined: Feb 2003
Posts: 877
Likes: 27
From: South Florida
Im getting vibration / whirring noise in 2wd, and grinding/whirring is even louder in 4x4. I replaced the bearings about a month ago. Truck also pulls to the right fairly hard when in 4x4. So im thinking maybe the hub isnt fully disengaging / engaging
Did front diff and tc fluid.
Did front diff and tc fluid.
Can you lift the front wheels up off the ground, and with the engine running and 2WD selected, do the front wheels free spin ? ( Do this in PARK, with the E-brake ON )
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Finally had a chance to do this
. With the truck kn the wheels do freespin
Logistics Pro
Joined: Jan 2001
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From: Central NYS
And then with the engine off do the axle shafts rotate when you rotate the corresponding front wheel?
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With engine off the wheels free spun and with the engine running the wheels also spun freely
Logistics Pro
Joined: Jan 2001
Posts: 3,740
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From: Central NYS
When you say the “the wheels free spun”, does that mean the axle shafts did not turn with the wheel?
If your front axle is not turning when you rotate the front wheel, that front actuator is not engaged.
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So what I’m trying to get at, did the axle shaft turn when you rotated the wheel?
When you say the “the wheels free spun”, does that mean the axle shafts did not turn with the wheel?
If your front axle is not turning when you rotate the front wheel, that front actuator is not engaged.
When you say the “the wheels free spun”, does that mean the axle shafts did not turn with the wheel?
If your front axle is not turning when you rotate the front wheel, that front actuator is not engaged.