Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

Anyone with 89 K5 and 4" Lift

Discussion in 'The Garage' started by caleb22, Mar 1, 2006.

  1. caleb22

    caleb22 1/2 ton status

    Joined:
    Apr 15, 2005
    Posts:
    193
    Likes Received:
    0
    Location:
    SC
    I have a 89 K5 with 4" TC springs, ORD shackle flip in rear, SX8000 shocks, and a 10 degree shim. When we did the lift the pinion angle difference was about 10 degrees.

    I still get a bad vibration from the drive shaft in the rear above 20mph, and especially when decelerating. I wanted to know from anyone who may have done the same type of lift combo what degree shim they used and if they did anything different.

    Just gathering info before we dive deeper. :)
     
  2. sandawgk5

    sandawgk5 3/4 ton status

    Joined:
    Oct 28, 2003
    Posts:
    6,881
    Likes Received:
    1
    Location:
    Kitsap County PACNORWEST
    I have an 87 with 4" DIY flip in rear and my pinion is almost directly at my tcase. I did not shim at all but by calculations I need a 8 or 10deg shim. I do not have any vibes at all unless I coast. I am also running the stock driveshaft.

    [​IMG]
    [​IMG]

    I also flipped the brackets and run 56s in the rear.

    Ira
     
  3. tiger9297

    tiger9297 1/2 ton status

    Joined:
    Jul 23, 2004
    Posts:
    1,205
    Likes Received:
    0
    Location:
    Tupelo, Mississippi
    I have a '90 K5 w/ 4" lift and mine vibrated too. I orderd a new shaft w/ CV joint from Rye Valley Oil and Gear. They came highly recommended. Mine has no vibration now at any speed.
     
  4. caleb22

    caleb22 1/2 ton status

    Joined:
    Apr 15, 2005
    Posts:
    193
    Likes Received:
    0
    Location:
    SC
    I took it all apart today and tried a 6 degree shim, still has vibrations at 20mph and higher, and under deceleration. I also put in new HD ujoints today as well.
     
  5. 88Silverado

    88Silverado 1/2 ton status

    Joined:
    Mar 13, 2003
    Posts:
    2,664
    Likes Received:
    0
    Location:
    Quartz Hill, So. Cal
    If you havent already you can try dropping the rear of the transfer case down. Pretty easy just to try to see if the vibe goes away. It worked for my 88
     
  6. NEK5

    NEK5 3/4 ton status Premium Member

    Joined:
    Oct 25, 2005
    Posts:
    9,843
    Likes Received:
    37
    Location:
    Ipswich MA
    i have 4 inch too and no vibrations
     

Share This Page