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Harmonic Vibration

Discussion in 'Differential & Driveline' started by Frankenchevy, Nov 22, 2019.

  1. Frankenchevy

    Frankenchevy Supporting Member Supporting Member

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    Okay, so I am a complete idiot sometimes. I crawled back under the truck and went through the mental checklist nice and slow and as I’m sitting there staring at my driveshaft I thought to myself, “gee, that diff looks like it’s pointing straight at my transfer case.”

    I’m not sure how I missed it several times, but my factory steel shims were installed backwards. Now that they’re turned around, my diff yoke to driveshaft angle matches my transfer case yoke to driveshaft angle. That ought to be the source of my troubles. Lol
     
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  2. Frankenchevy

    Frankenchevy Supporting Member Supporting Member

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    I checked my front driveshaft, no zerk. Which makes sense—I read on the steelsoldiers website that the cucv didn’t come with a zerk for whatever reason. The conversation was about the elimination of the boot and replacing the shaft altogether.
     
  3. Snoots

    Snoots Supporting Member Supporting Member

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    thumb.gif party 1.gif cheers.gif
     
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  4. Craig 85

    Craig 85 Full Access Member

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    I know on my 2016 Ram 2500 the front cardin joint had a flush "needle style" zerk fitting similar to the one below, but was buried in the center of the joint. I can't imagine the military wouldn't have some way to lube the front driveshaft and just relied on a boot. The military has done stranger things though.

    [​IMG]
    [​IMG]
     
  5. shiftpro

    shiftpro Full Access Member

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    Rather anticlimactic... yawn.
    I hope you got it.
     
  6. Frankenchevy

    Frankenchevy Supporting Member Supporting Member

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    Swing and a miss...

    I’m sure my driveshaft is happy with it’s return to correct geometry, but it wasn’t the problem. I was also wrong about it being only with the throttle on and now I can feel it a bit in the steering.

    This might be it. I guess I should throw the new tie rods on.

     
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  7. Frankenchevy

    Frankenchevy Supporting Member Supporting Member

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    The moogs definitely don’t look as beefy as the originals as far as physical size. FE9328D4-7A8F-47C1-B616-740A5CC0DC08.jpeg
     
  8. Craig 85

    Craig 85 Full Access Member

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    I think my Napa ones were the same.
     
  9. Frankenchevy

    Frankenchevy Supporting Member Supporting Member

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    Anyone know the torque spec for k30 tie rod and drag link castle nuts? I read 45lbs, just wanting to confirm.
     
  10. Frankenchevy

    Frankenchevy Supporting Member Supporting Member

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    I’m waiting on the long piece for the tie rod. Already had the short piece and the drag links. Tore the truck apart this afternoon because UPS showed it in transit from the facility about a half hour away. I’m beginning to not believe them...

    1EB829CE-4DF3-467F-A271-B0107E8F6071.jpeg
     
  11. shiftpro

    shiftpro Full Access Member

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    The saga continues... I'm all happy again.
     
  12. Frankenchevy

    Frankenchevy Supporting Member Supporting Member

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    They ave me excited again. But could it be, Saturday delivery from UPS? They do Saturday delivery to my business, but to a residence is not usual. Maybe it’s a holiday thing?
    9D8B07AE-F4D6-483C-9E71-A69BEBA29BFA.png
     
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  13. Frankenchevy

    Frankenchevy Supporting Member Supporting Member

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    Well I got the steering all taken care of. Swing and a miss again. I’m going to pull the trigger on an Eaton truetrac or a Detroit this week through a diff guy and have him rebuild the rear end.

    If it turns out that the driveline shop did a poor job on the balance, that’d suck. It’s some sort of computer balancing, though.
     
    Last edited: Dec 9, 2019
  14. Frankenchevy

    Frankenchevy Supporting Member Supporting Member

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    I made an appointment for Friday at the diff shop. He’s going to install new wheel bearings and seals that I already have. Additionally, he’s going to put in an Eaton truetrac, new carrier bearings and new pinion bearing. Total for parts and labor is $1400. Does that sound reasonable?

    The true trac alone is $750 +tax. I’d say with bearings, shims etc there’s probably $900 in parts...
     
  15. shiftpro

    shiftpro Full Access Member

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    Considering the times we live in, yes reasonable for sure.
     
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