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Driveshaft Balance

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 90K5, Mar 14, 2001.

  1. 90K5

    90K5 1/2 ton status

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    I took my front driveshaft off the other day to change a U-joint and being such a smart person I forgot to mark the position of the driveshaft on the yokes where it bolts on. I think the part where it goes to the t-case has some blue paint on it so I may be able to match it up, but the front has no marks. Does it really matter if it is not on the same way it was before?

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     
  2. Waxer

    Waxer 1/2 ton status Author

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    Not really. I have taken mine off many times to service it and just put it back on. Same for the rear. No vibrations and no problems at all. Just slap it in and you'll be fine.
     
  3. BlazerGuy

    BlazerGuy 3/4 ton status

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    It doesn't matter, I just replaced both of the u-joints on the rear driveshaft and I didn't mark it before I took it out and there aren't any vibrations

    Murphy's Laws on Life :
    "Opportunity always knocks at the least opportune time." [​IMG]
     
  4. Chaz88K5

    Chaz88K5 1/2 ton status

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    I have never had a prob with that either....pull it out and stick it in..no problems =-) haha

    Chaz

    "Hondas look good under a k5's tires"
     
  5. bigjbear

    bigjbear 1 ton status Staff Member Moderator

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    The part that matters is the slip splines. If you pull the shaft appart and don't put is back the same way the u-joints will be out of phase. Then you get to be the expert at changing them.

    Jim '80 GMC
    Freedom First!
    <A target="_blank" HREF=http://www.bigjbear.coloradok5.com>http://www.bigjbear.coloradok5.com</A>
     
  6. dyeager535

    dyeager535 1 ton status Premium Member

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    I have heard this all the time too. I think even the Haynes mentions it. But since the driveshaft is balanced seperately (IE they don't balance it with the yokes, pinion attached, do they) no matter what way it goes back in, it will be balanced. If it mattered, there would be no reason to have a driveshaft balanced when you had one made, as the other components it attaches to, and rotates at the same speed, are not balanced as a unit.

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     
  7. bigjbear

    bigjbear 1 ton status Staff Member Moderator

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    It is not just the balance, it is the phasing of the u-joints. The front shaft (what was being worked on) does not have a slip yoke, it has a slip spline/slip shaft. If it is reassembeled out of phase the joints will bind as the shaft rotates. This more of a problem with full time cases, but applies to anyone who uses 4WD. Like I said as long as you didn't take the shaft appart (at the splines) you won't have a problem.

    Jim '80 GMC
    Freedom First!
    <A target="_blank" HREF=http://www.bigjbear.coloradok5.com>http://www.bigjbear.coloradok5.com</A>
     
  8. reddog64

    reddog64 1/2 ton status

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    It does not mater... I just did mine last night... had the driveshaft guy help me with one of the u-joints.. he has done this for 20 years and said it doesnt matter... as long as you get the slines on the yokes lines up right... mine only went in one way though...

    Um... yes officer I know it's too big...
     

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