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Driveline Vibration

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by solowookie, Dec 11, 2001.

  1. solowookie

    solowookie 1/2 ton status

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    OK here's the million $$$ question for the day; when I lowered JMT back to stock height I used stock springs in the front, and rear was 2" after market springs & blocks with an adda leaf. I pulled the adda leaf, and the blocks. (don't know what kind, and don't even know for sure that they were 2", but it seems to sit about an inch high in the back now).

    anyway after I lowered it I started getting driveline vibration. this morning I took the spacers on the cross members and moved them back on top of the frame which took care of most of the problem.

    I have some shims that I can use to change the angle of the axle, and I am wondering if this should be my next step. any suggestions???

    <font color=blue> Jeff - may the force be with you</font color=blue>
    <a target="_blank" href=http://coloradok5.com/gallery/Jeffs-Stuff>link to k5's</a>
     
  2. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    The best place to start is to measure the angle of the pinion from level and angle of the t-case output from level. By lowering the vehicle and taking out the blocks (which may have had a degree or two built into them) you could have possible changed the driveshaft operating angle(s). If they are different (which can cause the vibes you speak of), then you can shim the pinion as necessary. Or you can just stick the shims in and see if it gets better/worse, but that is the "trial-by-error" method. Although I have been guilty of that from time to time [​IMG]!

    See my rig at <a target="_blank" href=http://coloradok5.com/gallery/Leadfoot> click here </a>
     
  3. ftn96

    ftn96 1/2 ton status

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    You've got to have an angle finder. Hell, you've got 2 blazers both with drivelines and both are subject to angles variances.
    the only real way to play with the angles and not waste your time is am angle finder!!!! They are cheap!!!!! And Priceless!!!!

    Still hoping the GOV'T will ban the use of loud stereos with RAP music. [​IMG]
    <a target="_blank" href=http://www.nashvillek5.freeservers.com>www.nashvillek5.freeservers.com</a>
     
  4. wayne

    wayne 3/4 ton status

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    Also you might want to try a new set of u-joints.

    See <a target="_blank" href=http://coloradok5.com/gallery/Waynes-Toy>Project Mighty Mouse</a> here.
    <font color=blue>Wayne<font color=blue>
    <font color=blue>Happy Trails<font color=blue>
     
  5. solowookie

    solowookie 1/2 ton status

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    where do you get an angle finder? I know there are the ones used for carpentry etc.???

    one of the u-joints on the axle is new as of the engine rebuild so it shouldn't be a big problem.

    what is the angle the u-joints should be at? I'm thinking between 2-3 degree's if I remember correctly?

    <font color=blue> Jeff - may the force be with you</font color=blue>
    <a target="_blank" href=http://coloradok5.com/gallery/Jeffs-Stuff>link to k5's</a>
     
  6. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    You can get an angle finder from Jeg's or Summit I think (it's made by Competion Engineering, which is the one I bought). As far as angles they can be anything as long the the difference between the operating angle of the driveshaft is ~3 degrees within the angle of the pinion and the angle of the t-case yoke/slip shaft (with those two being identical). If the driveshaft is at +10 degrees and the pinion and t-case are at +7 degrees you are good to go, the driveshaft at -15 with -12 at the yokes good to go, etc. It's all relative to each other. You can run more than 3 degrees but A.) u-joint life is greatly decreased the more you run and B.) the higher the likelyhood of unwanted vibration. The goal is two have the pinion angle equal the t-case yoke angle (or maybe even a degree down, as the pinion rotates up under torque), and both those angles within 3 degrees of the operating angle of the driveshaft, that was how it was explained to me.

    See my rig at <a target="_blank" href=http://coloradok5.com/gallery/Leadfoot> click here </a>
     
  7. ftn96

    ftn96 1/2 ton status

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    You can order one from Harbor Freight or Snap-on. The Snap-on one cost me 25.00 including shipping. I have heard the HF one is about 6 or 7 bones.

    Still hoping the GOV'T will ban the use of loud stereos with RAP music. [​IMG]
    <a target="_blank" href=http://www.nashvillek5.freeservers.com>www.nashvillek5.freeservers.com</a>
     
  8. HarryH3

    HarryH3 1 ton status Author

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    Sears sells a magnetic angle finder for $10-12. [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <a target="_blank" href=http://www.angelfire.com/super/ThunderTruck>www.angelfire.com/super/ThunderTruck</a>
    It's a great day to be alive...
     
  9. ftn96

    ftn96 1/2 ton status

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    Sears was the first place I looked but they didn't carry it at the local store.

    Still hoping the GOV'T will ban the use of loud stereos with RAP music. [​IMG]
    <a target="_blank" href=http://www.nashvillek5.freeservers.com>www.nashvillek5.freeservers.com</a>
     
  10. solowookie

    solowookie 1/2 ton status

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    well guys I don't think I'm gonna tinker with it anymore until I get somewhere to get an angle finder. thanks for the info / advice guys!

    <font color=blue> Jeff - may the force be with you</font color=blue>
    <a target="_blank" href=http://coloradok5.com/gallery/Jeffs-Stuff>link to k5's</a>
     

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