Is this front u joints or hubs? - Ford Powerstroke Diesel Forum
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post #1 of 14 Old 02-17-2014, 08:17 PM Thread Starter
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Is this front u joints or hubs?

So my truck has been having this thunking in the front end whenever I'm taking off from a stop and I'm turning either way. It almost acts like the truck is engaged in 4x4 and you turn on dry pavement, just not to that extent. If I take off and I'm heading straight it doesn't do it at all, just when I'm turning. And the 4x4 isn't engaged and the hubs aren't locked either. If I'm on snow covered roads, parking lots etc I don't notice it that much just dry surfaces. I feel it in the steering and it's a repetitive thunk thunk thunk. I have 107k and didn't know if worn u joints in the front would do that or the hubs. Not a whole lot of moving parts up front?




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post #2 of 14 Old 02-18-2014, 05:43 AM
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Sounds as if one of your hubs hasn't fully disengaged. I know on trail rigs at least repacking the hubs is pretty commonplace and it might help your situation. I don't know one way or the other about the U joints though. One quick way to see if the hubs are disengaged is if the front shaft isn't moving when the truck is.

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post #3 of 14 Old 02-18-2014, 05:54 AM
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your front u joints shouldn't clunk when turning if they are unlocked even if they are bad

first thing to do is reach in to the open knuckle on each side and see if you can turn them by hand if they are locked turn the hub from auto to unlocked and back a few times and try again

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post #4 of 14 Old 02-18-2014, 05:59 AM Thread Starter
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Ok thanks I'll try that. I know a few times when I engaged 4x4 when it was way below 0 deg the auto hubs wouldn't engage. I had to manually lock the hubs then it would engage whenever I wanted. I've heard not to repack them too much.




08 F350 crew 4x4
H&S mini, Sinister egr delete, cold side pipe, 5" straight pipe, S&B intake, 3.5" level, Newton bars, coolant filter, 325's duratracs, ARP studs, 6.0 manifolds, flow pro DP, Detroit truetrac, triple disk converter, led bed lights

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post #5 of 14 Old 02-18-2014, 06:16 AM
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u can lube them a little u just don't want to bury them in grease they count on a vacuum signal so you don't want to effect that

post back because if your hubs are locked and the noise your hearing is your u joint u will need to address that

u can jack it up and check the unit bearing and u joint as you turn the tire

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post #6 of 14 Old 02-18-2014, 06:22 AM Thread Starter
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Passenger side hub. Drivers spins and the pass is still locked. Do they need to be unlocked and moving freely before taking the hub out? Or can I remove the hub with it still locked in?




08 F350 crew 4x4
H&S mini, Sinister egr delete, cold side pipe, 5" straight pipe, S&B intake, 3.5" level, Newton bars, coolant filter, 325's duratracs, ARP studs, 6.0 manifolds, flow pro DP, Detroit truetrac, triple disk converter, led bed lights

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post #7 of 14 Old 02-18-2014, 06:26 AM
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Yeah you can take it out when it's still locked.

2010 F350 Lariat CCLB - The Tow Rig - S&B Intake. H&S MiniMaxx. 4" FloPro DP. 5" FloPro DP-Back.

2001 Explorer Sport Trac - The Trail Rig - Dana44 Solid Axle Swap. Spring over conversion in the rear. Rolling on 35s with ~14" of travel at all 4 corners

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post #8 of 14 Old 02-18-2014, 06:29 AM
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try the manual auto back and forth a few times and see if it unlocks

but I agree it will be removable either way

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post #9 of 14 Old 02-18-2014, 06:33 AM Thread Starter
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Yeah I tried manual turning about 8-10 times. Nothing




08 F350 crew 4x4
H&S mini, Sinister egr delete, cold side pipe, 5" straight pipe, S&B intake, 3.5" level, Newton bars, coolant filter, 325's duratracs, ARP studs, 6.0 manifolds, flow pro DP, Detroit truetrac, triple disk converter, led bed lights

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post #10 of 14 Old 02-18-2014, 06:35 AM
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ahh if u need a new hub ebay has the best deals just make sure you buy an auto hub the manual ones look the same

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