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new lift...vibration

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by blazeitup, Jan 9, 2001.

  1. blazeitup

    blazeitup Registered Member

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    Location:
    Longmont, CO
    I just put a new 6" Skyjacker lift and 35" BFG Muds on my '86 K5 a week ago. I have a vibration from about 15 to 25 mph. I have allready moved the t-case spacers. I think it might be the forward u-joint on my rear driveshaft. I replaced it about 2 months ago so it is realatively new, but maybe the angle is too steep. I also put a 14 bolt FF in the rear and used the offset u-joint there. So I was wondering if anyone has any ideas about that. I also saw a post a few months ago about a 700r4 speedo calibration kit...any info about it would be great. thanks
     
  2. DPI

    DPI 1/2 ton status

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    The first thing you should do is check your angles and make sure the are equal but at oppisite angles. You can get a dial angle finder at Harbour Freight or Sears. I installed a similar setup in my K5. My angles were at 17-19 degress and a little to steep for my taste. So I installed this and moved the axle pinion up to nearly eliminate that angle.
    <IMG SRC="http://albums.photopoint.com/j/View?u=1439605&a=10797147&p=37537438&Sequence=0[/image]


    [image]http://www.metro-dade.com/firerescue/images/web elements & logos/testpulse.gif">
     
  3. drivelineman

    drivelineman 1/2 ton status

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    tHAT IS THE C/V SET UP YOU NEED THERE-
     
  4. ftn96

    ftn96 1/2 ton status

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    Driveline man!! The CV shaft that is in the above pic, can it be used with a solid shaft and a slip yoke?

    Will work for parts, beer and sex.
    90 Jimi,350/700R4/241/10bolts/3.73's/33's/4"
    <A target="_blank" HREF=http://mccordhouse.freeservers.com>http://mccordhouse.freeservers.com</A>
     
  5. kpanza

    kpanza 1/2 ton status

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    Lake Forest, Orange County, California
    Sounds like what happened to me exactly. I have an '87, went from a 4" to 6" lift and also installed a 14 bolt FF at the same time. Mine was vibrating at any speed when letting off the gas...I dropped the t-case and it seemed to help a lot, still have a slight vibration at higher speeds (65+), but the lower speed vibes are pretty much gone. I used the ORD shackle flip and the 2.5" lift springs in rear, and my springs had shims to correct angle. Seemed like the combo was too much, but when the t-case came down it helped. I am gonna do the CV shaft when money allows, that is the only surefire way to cure it if it is still vibrating...and I don't like the t-case dropped, screws other stuff up...
     

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