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Old 07-04-2011, 10:09 PM
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Clunking noise

Ok, so the truck has been just fine up until now. But I jumped in and fired it up today and have a problem. Got a "chunk chunk chunk" noise going on. It's directly related to wheel speed. Here are some pics:

These bolt were loose, the little clamps holding the yolk to the u joint. I dont know how they came loose, but I tightened them up. Dont know If I should have done that, but I figured its better than being loose.



Pinion seal is leaking preatty bad too, I'm wondering if it has something to do with the noise, being as the truck sat for 12 hours before moving, so I'm wondering if its just the dif grinding now:




Here is some wear on the u joint Jarrod noticed, There isnt a whole lot of play in the u joint. So little that a vid wouldnt show it. You have to grab both yolks and work it. It only moves a hair on the axis attached to the axle yolk.

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Yall dont think it could be in the t-case do you? It seems really loud in the cab. I plan on jacking up the rear end in the morning and seein where its coming from with it in gear.
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Old 07-04-2011, 11:10 PM
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oh yeah, its definately louder when i'm on the throttle and louder when im going faster.
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Old 07-05-2011, 03:18 AM
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OK, definately not the DMF (i hope, unless its a ventriliquist and can throw noises to the back of the truck). It does not seem to be the u joints, front or rear. Here is what I'm thinking: pinion bearing. It has a decent bit of play and is definately leaking (so I'll need a pinion seal too).... So here's my question. Would it just be the outer bearing? And how hard is this to do???
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Old 07-05-2011, 03:55 AM
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Ok apparently I'm a crack head, because I crawled back under there and it didn't have nearly as much play as I thought. Could it just be the pinion seal? Could enough fluid loss cause clunking in the rear end? Or is there definately a bearing problem?


It would be nice if I wasn't the only one responding to my own thread.....
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Old 07-05-2011, 05:10 AM
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If it constantly does it while driving then I would say that there is something broken inside the chunk. If it were just a U-joint they tend to stop making noise and just vibrate when speed is high enough for certrifical force to take over. I would pull the diff cover and have a look.
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Old 07-05-2011, 05:36 AM
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Ok, got in there AGAIN, looked all around, got after it.... noticed it seemed to be coming from the driver's side. Under low speed i noticed how it moved in and out. So shut it down and took the wheel off. took the axle shaft out.... a lot of play in the hub before i did this. tightened the axle nut down. hardly any play now. hope this works...
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Old 07-05-2011, 05:38 AM
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Quote:
Originally Posted by Ryan Rønning View Post
If it constantly does it while driving then I would say that there is something broken inside the chunk. If it were just a U-joint they tend to stop making noise and just vibrate when speed is high enough for certrifical force to take over. I would pull the diff cover and have a look.
if this doesnt work i'll try that. but just now when i had my truck idling in 5th, i put my ear to the dif and it was quiet in there.

Thanks for responding though Ryan!
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Old 07-05-2011, 05:42 AM
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Tightened the axle nut?? These trucks don't have axle nuts...
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Old 07-05-2011, 05:45 AM
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Originally Posted by Zaairman View Post
Tightened the axle nut?? These trucks don't have axle nuts...
Idk what yall call it, it holds the hub on the axle. regardless, its tighter and ima gonna go see if that worked. lol
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Old 07-05-2011, 07:19 AM
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Didn't work. Truck is in local shop now. They normally take care of me well.

It's a sad day when I can't at least find the problem

Hope its not my DMF.....
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