4WD OUT AFTER BALL AND U-JOINT REPLACEMENT - Ford Powerstroke Diesel Forum
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Old 11-24-2013, 08:28 AM
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4WD OUT AFTER BALL AND U-JOINT REPLACEMENT

So i replaced my ball joints and u-joint on the passenger side on my 2000 f250 7.3, I put everything back together exactly the same way it came out but now my 4wd doesnt lock in. It did lock in before i replaced these parts. I have lock out hubs..

When i was replacing the parts a little valve type thing broke off of the hub assembly, it almost looked like a grease fitting but it wasnt. A rubber tube hooked up to it. This is the only thing that i can see being the problem b/c everything went back together fine. Does little tube have somthing to do w/ the 4wd vaccum or somthin?? Or any other ideas why my 4wd doesnt engage anymore?? Any input is appreciated, winter is coming up and i gotta get it fixed thanks anyone!!
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Old 11-24-2013, 09:20 AM
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Sounds like you broke a vacuum line at the fitting, but I can't be for sure.
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Old 11-24-2013, 09:48 AM
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Quote:
Originally Posted by wvrrcarknocker View Post
Sounds like you broke a vacuum line at the fitting, but I can't be for sure.
Yeah it was a fitting that broke. The line itself didnt tear or anything. Its just a rubber line, i thought it was a line for the brakes or somthing but no fluid came out when i took it off the fitting before it broke. Im not familiar with the vaccum system . So you think it could be as simple as replacing that fitting and reconnecting the line than?
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Old 11-24-2013, 09:53 AM
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I believe it's exactly that simple. Couldn't hurt. If the line was there, it was there for a reason.
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Old 11-24-2013, 09:55 AM
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Also if you didnt replace outer seal and install it properly your auto locking/vacuum hubs will not work right. Just put manual hubs in and be done with it.
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Old 11-24-2013, 10:12 AM
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that rubber line is the vacuum line for the auto hubs.

you can still manually lock the hubs, but you better grab some pliers, the stock hubs are extremely hard to lock manually.

mile marker has manual hubs for 140 bucks from xdp

the vacuum lines dry rot as well, im sure they are toast anyways.
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Old 11-24-2013, 11:05 AM
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Originally Posted by dr8082 View Post
Also if you didnt replace outer seal and install it properly your auto locking/vacuum hubs will not work right. Just put manual hubs in and be done with it.
I do have manual hubs sorry i stated that wrong. The guy i bought my truck from had it setup. Im confused now.. you made it seem like the vaccum doesnt matter for manual hubs..? if thats the case than the line wouldnt be the prob?
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Old 11-24-2013, 11:12 AM
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Yeah if you have manual after market hubs and they are locked then the vacuum line and outer seal is not an issue.
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Old 11-24-2013, 01:28 PM
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Not sure why my 4wd is out then. My only idea was that fitting that broke.. Everything was fine before i replaced the parts and i was careful to put everything back together correctly.
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Old 11-24-2013, 04:49 PM
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Test the system.
1 put in 4x4. hubs unlocked. climb under truck rotate driveshaft, should see the front axles turn or move. (should turn back and forth)
2 in 2x4 and hubs unlocked. driveshaft should turn free.
3 in 4x4 hubs locked the drive shaft should only wiggle back and forth.
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