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  #1  
Old 09-18-2005, 03:07 PM
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Default A little help needed... strange noise up front

Howdy Everyone-

I have this posted over on ih8mud, but thought I would throw it out over here. I have this popping noise comming from up front. It only happens when:

The axle articulates (not much is needed just a bump will do).
Not speed related, in fact, I dont hear it at cruising speed.
happens a bit more when turning.

I have put it up on jack stands level and articulated and couldnt get it to happen with the steering being moved. Nothing in the steering is binding. Yesterday, I pulled both birfs and gave them a thorough look, nothing is out of the ordinary there either, they both look and operate great.

Some guys have suggested springs are suspect, and I should try oiling them, any other thoughts?

I am hoping for a nice ride up Conney Flats next weekend and I want to find out what this noise is and correct it.

Thank you in advance.

Rezarf <><
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Old 09-18-2005, 04:26 PM
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I think is is your 40, but vehicle specs would help.

Why do you think its springs and not Birfields?
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Old 09-18-2005, 04:28 PM
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Sorry-

76 fj40. 35's 4" SUA lift. 4:11's stock axles.

I don't think it is the birfs because I just pulled them yesterday and there was nothing visually to make me think they were not in good shape. No binding, not wear marks, no pitting, no cracks, everything looked and operated great.

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Old 09-18-2005, 08:32 PM
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Did you pull the birfields apart? If not then you did not fully inspect them. In reading your post, it sounds like it pops in 2 wheel drive with the hubs disengaged? If this is correct then the Birf are not the problem. Have some one else turn the steering wheel when you are in front, this may help you find the problem. Look at tie rod ends, look bolts, shifting shackles, any thing under the front end. later robbie
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Old 09-18-2005, 10:34 PM
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I have drive flanges, not hubs, hubs are coming this week I hope they "fix" or at least identify the problem.

Thanks again-

Drew
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Old 09-19-2005, 05:19 PM
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I had the same symptom, but I knew exactly what it was based on when and how it happened. Tightened up the front spring pack u-bolts and no more clunk/bumping while articulating/turning. These were new u-bolts when I lifted a year and a half ago, I had retorqued them after about 100 or so miles, but they still needed to be retorqued again after a couple thousand.

The sound was caused by the leaves shifting around within the packs. This may not be the cause of your sound, but it was for mine.
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Old 09-22-2005, 05:12 PM
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Well, I got new hubs on and I still have the popping sound. Jeff, I will put a wrench on my u bolts and center pins and post back up.

Rezarf <><
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My rig... "Maude"
1976 FJ40 with some stuff and some leaks.

2001 Sequoia Limited with heated seats

My camping trailer build up thread.

"You 80 guys are just a Sawzall away from nirvana." -Red Chili
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Old 09-22-2005, 05:32 PM
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It never hurts to at least check them. If they're torqued properly, then at least you've eliminated that as a potential cause.
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Old 09-22-2005, 11:23 PM
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S'pose it could be tie rod ends? Do you notice any change in your steering when this happens?
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  #10  
Old 09-23-2005, 10:26 AM
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Nope, I did notice that when I bump a curb (like my driveway) straight on it will not pop. However, if I take the curb one wheel at a time I get the pop nearly everytime.

Nothing noticeable in my steering at all. This is driving me crazy!

Thanks for you help everyone- I appreciate it.

Drew <><
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My rig... "Maude"
1976 FJ40 with some stuff and some leaks.

2001 Sequoia Limited with heated seats

My camping trailer build up thread.

"You 80 guys are just a Sawzall away from nirvana." -Red Chili
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