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Driveshaft degrees

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by dewey, Dec 23, 2000.

  1. dewey

    dewey Registered Member

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    Does anyone know how many degrees difference the driveshaft can take without vibration? i have a 3 inch lift, I lowered the tranny about 1.5 inches (just put the spacers between the frame and crossmember). This put the output angle at 12 degrees, and the pinion angle at 7-8 degrees. How much lower can i lower the end of the tranny?
    thanks for any help...


    D.
     
  2. ftn96

    ftn96 1/2 ton status

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    I would;t put anymore than what you already have. You may need to install a shim under the rear springs. Those angles that you have are way to far off. I just yesterday, got both my angles to match up with 8 degrees at both ends. This with the stock t-case spacer and an extra washer, and with a 4 degree shim in the rear.
    If you lower your t-case any more, your going to get the front drive shaft angles way outta wack, not to mention your putting more pressure on the motor mounts, which can also cause a vidration. Also you move the fan up closer to the shroud as well. Thats about all I know about it. But yea, I think you'd benefit more with a 2 or 3 degree shim

    I miss my Ex, but my aim is getting better!
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  3. ftn96

    ftn96 1/2 ton status

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    sorry I forgot, the angles have to be with 1 to 2 degrees of one another.

    I miss my Ex, but my aim is getting better!
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  4. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    ftn96:
    Hows the vibes? Did flipping around the shims do the trick?

    Diging it in the dirt with my K5's
    Grim-Reaper
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  5. ftn96

    ftn96 1/2 ton status

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    Well, I hate to admit it but no. So I had to turn the shims back around the way they came. And I had to put an extra washer in with the spacer on the t-case, and now, my angles are both at 8 degree. And It runs pretty damn good.
    I just haven't had the front hubs locked yet, so I dont know if Im going to have problems with the front shaft. I need to get it out and continue the test driving some more. But I need to get longer break lines. Before I drive it too much more. They are real close to ripping at the slightest flex.

    I miss my Ex, but my aim is getting better!
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  6. dewey

    dewey Registered Member

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    I checked around on this before, and was told that the only place i could get some shims would be the local speed shop..
    If the angle at the end of the tranny is 12, and the angle at the pinion yoke is 8, the larger side of the shim has to go to the front or rear?
    Thanks Again..

    D.
     
  7. blazen91

    blazen91 1/2 ton status

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    So does matter what the degree is, aslong as the t-case and diff are the same or within 2 degrees difference?

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  8. HarryH3

    HarryH3 1 ton status Author

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    Spicer doesn't recommend an angle beyond about 7 degrees. More than that and you reduce the life of the u-joint (something all owners of lifted rigs already know!). [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
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  9. coopertwpk

    coopertwpk 1/2 ton status

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    dewey what kind of lift do you have in the rear? didnt your blocks come with an angle on them?
     
  10. dewey

    dewey Registered Member

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    it's a rough country lift. I put the blocks in just like they said. With the large side in the back...I know it cuts down on the u-joints life with the vibrations like this... I'm at the point where i think I should just take the lift out and modify the body.. At least it rode better.
    any ideas for a frustrated Jimmy fan?
    With all the talk on this site about new driveshafts, wedges and everything else, Why did I do this????

    D.
     
  11. ftn96

    ftn96 1/2 ton status

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    I feel about the same way Dewey. But once you get it right you'll be happy it over with. I still have a very slight vibration between 25 and 35, but its not too bad.
    Your just going to have to play with it, trial and error.
    Another thing to consider is, that when you increase or decrease the angle on one side you are also chnging th other angle as well. But not the same amount. I think it changes the opposite angle by half. So if you put 2 more degrees on the rear then the other end changes by 1. Or it may be visa versa.
    But don't loose hope, you get it. Just keep tinkering with it. Try what I did, and put a washer in with the spacers to give them and extra degree. And see if that helps.

    Will work for parts, beer and sex.
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  12. Shawn

    Shawn 1/2 ton status Premium Member Author

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    If you can't shake the vibes, consider running a CV joint in the rear. High Angle Driveline does a good job and if you wan't strength, they can produce some beefy 1350 CV shafts.

    Shawn
    87 K5
    few mods[​IMG]
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