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  #81  
Old 01-19-2021, 07:50 PM
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Quote:
Originally Posted by upallnight View Post
The OEM has voids in the rubber bushings so it must be installed in a certain wayside so the back and forth movement of the sub-frame is pushing on the rubber and not the void.
Yes, they have arrows that you point forward which I did.
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  #82  
Old 01-19-2021, 07:55 PM
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Originally Posted by andrewwynn View Post
Under load and not a high frequency moan/howl suggests CV axle. Does it change which steering input? Find a hill you can reproduce the sound/vibration and see if you can get it to change by steering pay the centerline.

Did you ever hear small tick tick sounds driving slow? (that's a guibo)

The CV I think it's six bearings so 3/revolution is off by two. If you get a spike at 6x revolution I would expect CV to be the source.

Have you ever had to change boot? Are CV Original (or recently changed)
No ticking, but I put in a fresh guibo along with the CSB.

I had a new axle installed on the right front a little less than 2 years ago. 23,000 miles on it. My indy did it. Don't know brand. Left front I haven't done anything with as long as I've been driving it. About 97,000 miles. Truck has 256,000 miles on it.
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  #83  
Old 01-19-2021, 10:46 PM
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Than my official top suspect is the left CV axle.

Six balls per revolution your vibration is close to 3x tire rev I'm suspecting you are getting a harmonic. If a FFT shows a sound close to 6x RPM of the wheel it's very likely.
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  #84  
Old 02-01-2021, 06:26 PM
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Update: went through my entire suspension system and checked torque on everything. Everything was to spec. The driver's side coilover preload was loose, so I went and re-preloaded the front coil overs. Checked my front drive shaft flex disk. It's almost new and looks to be in good shape. Checked the shaft to see if I could get it to move around side to side and it doesn't. I checked the movement on the front dif by rotating from resistance to resistance. It was about 9mm of slop. Anyone know what the lash spec is supposed to be? I couldn't find it. Also, anyone know what size allen wrench is needed for the fill and drain plugs?
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  #85  
Old 02-03-2021, 11:59 AM
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Originally Posted by Fifty150hs View Post
Update: went through my entire suspension system and checked torque on everything. Everything was to spec. The driver's side coilover preload was loose, so I went and re-preloaded the front coil overs. Checked my front drive shaft flex disk. It's almost new and looks to be in good shape. Checked the shaft to see if I could get it to move around side to side and it doesn't. I checked the movement on the front dif by rotating from resistance to resistance. It was about 9mm of slop. Anyone know what the lash spec is supposed to be? I couldn't find it. Also, anyone know what size allen wrench is needed for the fill and drain plugs?
Clarifying, the 9mm was measured at the outer edge of one of the bolts holding the front shaft to the diff.
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  #86  
Old 02-07-2021, 02:17 PM
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Another Update: I think I finally found my problem. Had things apart again yesterday to swap in control arms to see if I had a ply bushing failure. Discovered that the left front interior CV is shot. It allows excessive movement in and out. I can move the brake disc in and out about an inch! Put the wheel back on and, of course, movement at the tire is even worse. Checked it against the right front. Right front doesn't move. Makes sense. It's part of the drive line and the problem is worse under load and when turning. Ordered a new axle assembly. Will update after I get it installed. Fingers crossed.
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  #87  
Old 02-07-2021, 02:26 PM
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Something doesn't make sense. the cv joint has nothing to do with the brake disk/hub moving? That's all axle bearing and the nut holding it together.
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  #88  
Old 02-07-2021, 02:30 PM
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I had shake and shudder on and off for over two years just random times. Changed the axle and bearing and all is well.

The inner joint is designed to telescope but not the outer joint however after seeing the inside of the inner joint it would be very easy to expect that to be the cause.

More interesting in your case and you will like this: recall how i the outer joint had six balls so that worked out pretty well with the 3x wheel speed and would mean a harmonic?

The inner joint has THREE wheels and would mean you should get 3x wheel speed for your vibration.

I would say nearly 100% certain you found the source.

There was a small error in perfection as I think there math worked to like 2.7-2.8x per tire revolution but I think I may have forgotten to subtract the 3mph from the speedometer.

2.8/0.96=2.917 that's even closer!
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  #89  
Old 02-07-2021, 02:33 PM
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Quote:
Originally Posted by Fifty150hs View Post
Another Update: I think I finally found my problem. Had things apart again yesterday to swap in control arms to see if I had a ply bushing failure. Discovered that the left front interior CV is shot. It allows excessive movement in and out. I can move the brake disc in and out about an inch! Put the wheel back on and, of course, movement at the tire is even worse. Checked it against the right front. Right front doesn't move. Makes sense. It's part of the drive line and the problem is worse under load and when turning. Ordered a new axle assembly. Will update after I get it installed. Fingers crossed.
The inner CV joint on an axle is composed of three bearings on what they call a tripod. The inner CV joint is supposed to take up the horizontal lateral movement of the axle as the suspension moves up and down. The movement is small, so if what you are saying is that it is a lot I would make sure the inner CV joint splines are fully seated in the differential. I would also look to see that the front differential has the correct amount of fluid in it, as when an axle is pulled, fluid always seeps out.



If it is the outer CV joint that is moving in and out, you can just buy a new CV joint and replace it and keep your original axle.
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Last edited by upallnight; 02-07-2021 at 02:38 PM.
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  #90  
Old 02-07-2021, 02:34 PM
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Quote:
Originally Posted by 80stech View Post
Something doesn't make sense. the cv joint has nothing to do with the brake disk/hub moving? That's all axle bearing and the nut holding it together.

I think he meant rotate? Clearly the brake rotor can't move left/right relative to the car axis when it's captive in the caliper etc.

Anyhow, slop in the inner CV could very definitely be the cause of a drive train vibration that is worse under load and the coincidence of 3x wheel rotation is amazingly strong.
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