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Drive Shaft Vibration After Installing 3 degree axle shims

Discussion in 'Suspension' started by lpfe42, Jun 4, 2018.

  1. Jun 4, 2018 at 6:31 PM
    #1
    lpfe42

    lpfe42 [OP] Well-Known Member

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    I have a 2017 DCSB OR After the shop installed 3 degree shims to fix a little Vibration then the vibration got worse its happenes when i'm slowing down between 15-5 mph I have the OME EL095R 2.75" Leaf Spring Any help to fix this would be appreciated
     
  2. Jun 5, 2018 at 11:14 AM
    #2
    STexaslovestacos

    STexaslovestacos Well-Known Member

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    You need to actually go out and measure your angles. You don't solve driveline vibrations by blindly throwing parts at things.

    In short, you want your axle nose to be just barely nose-down from parallel with your transmission output (like -0.3 degrees from exactly parallel) and your driveshaft halves need to be almost, but not perfectly, straight with respect to each other.

    I just put Dakars on my truck and found that they were arched perfectly to get the axle angle correct, and all I had to do was shim the carrier bearing down to get the driveshaft stubs close to being in line.
     
    Toynado and lpfe42 [OP] like this.
  3. Jun 5, 2018 at 12:15 PM
    #3
    lpfe42

    lpfe42 [OP] Well-Known Member

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    Thank you for the info:thumbsup:
     
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  4. Jun 5, 2018 at 12:16 PM
    #4
    STexaslovestacos

    STexaslovestacos Well-Known Member

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    Harbor Freight sells a digital angle-finder doohickey for like $40! I'd recommend using a good metal ruler or something and checking your nose angle using the u-joint bolts as a flat surface.

    For reference, you want a slight nose-down on the axle nose because it will want to rotate upwards under power, so if you put it slightly nose down it should pretty much line up once you apply the fun pedal.

    The driveshaft stubs need to be ever-so-slightly off from each other because otherwise the u-joints won't keep themselves lubricated. less than a degree is the target.
     
  5. Jun 5, 2018 at 12:24 PM
    #5
    Littles

    Littles Stupid is as stupid does.

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  6. Jun 5, 2018 at 12:56 PM
    #6
    STexaslovestacos

    STexaslovestacos Well-Known Member

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  7. Jun 5, 2018 at 1:31 PM
    #7
    lpfe42

    lpfe42 [OP] Well-Known Member

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    I have One of these on order

    530038BA-580C-40BD-A630-EC0468A87CF0.jpg
     
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  8. Apr 12, 2019 at 1:27 AM
    #8
    Vjtrey1

    Vjtrey1 Well-Known Member

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    Hey buddy I did the same thing but I experiencing deceleration shudder at 25-15 mph. Here is my measurements.

    TC 2.8
    1st shaft 7.2
    2nd shaft 7.5
    Pinion 3.0

    TC - Pinion = 0.2
    2nd joint near cb= 0.3

    1st joint - 4.4
    2nd joint - 0.3
    3rd joint - 4.5

    Hope you can help me thanks.
     
    unk likes this.
  9. Apr 27, 2019 at 1:21 PM
    #9
    surfyota

    surfyota Well-Known Member

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    If it only happens when slowing down could possibly be the brakes. You don't have an vibes while accelerating or highway speeds?
     
  10. May 8, 2019 at 8:58 PM
    #10
    whatjones911

    whatjones911 Well-Known Member

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    What size carrier bearing drop did you use to get those angles?
     
  11. May 9, 2019 at 9:42 PM
    #11
    08BajaBoy

    08BajaBoy Well-Known Member

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    @lpfe42 how many miles do you have on you're rig? Did you add a larger tire size when you added the leaf springs? Did you make sure the ubolts were torqued to spec?
     
  12. May 10, 2019 at 2:21 PM
    #12
    Vjtrey1

    Vjtrey1 Well-Known Member

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    Update I already fixed the issue, i removed the cb drop and install the 3 degree axle shim. Fixed the problem!
     
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  13. May 10, 2019 at 3:24 PM
    #13
    whatjones911

    whatjones911 Well-Known Member

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    @Vjtrey1 did you happen to measure the angles?
     
  14. May 10, 2019 at 3:36 PM
    #14
    Vjtrey1

    Vjtrey1 Well-Known Member

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    Sorry i didn't i was tired as f*** adjusting the angles. No matter how perfect your angles are if the diff axle is warping in various speed it will shrud or vib so what happen is when you accelerate the rear diff goes up and when slowing down it goes down. In my case my rear diff angle is pointing down due to lift but not too much. So when I am slowing down to 30mph it shudder. I fixed it by installing axel shims which is 3 degree pointed side facing front compensate with the axle warp.
     
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  15. May 10, 2019 at 3:40 PM
    #15
    Vjtrey1

    Vjtrey1 Well-Known Member

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    I used 2 flat thick washer stock together. I got it from lowes.
     
  16. May 10, 2019 at 8:05 PM
    #16
    whatjones911

    whatjones911 Well-Known Member

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    Happy to hear you’ve reached a vibration free setup.

    My best combo I’ve discovered so far is a 4* degree shim and a 1/2 inch carrier bearing drop. Only take off shudder 5-10 mph, a lot less violent shudder than at 3* shim. No deceleration vibration, which it had as stock from day one so that’s an improvement.

    I’m pretty much defeated. I will just stick with the take off shudder. It seems to me the center working angle needs to be close to zero as possible. I could drop the carrier bearing more but that would bring the TC working angle well over 5* and that itself will introduce new vibrations.
     
  17. May 10, 2019 at 8:33 PM
    #17
    Vjtrey1

    Vjtrey1 Well-Known Member

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    Try to remove the cb drop and see unless you tried it already.
     
  18. May 10, 2019 at 8:48 PM
    #18
    TheGoat

    TheGoat Well-Known Member

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    Last edited: May 10, 2019
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  19. May 10, 2019 at 8:53 PM
    #19
    whatjones911

    whatjones911 Well-Known Member

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    Tried that. It made it worse. The 4* and CB drop has the least shudder from the many combos I tried.
     
  20. May 10, 2019 at 10:22 PM
    #20
    Murkules

    Murkules Well-Known Member

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    Did you face the shims the correct way? had a friend complain about the same issue, turned out he had the skinnier side facing the rear..
     

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