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Yet another vibration

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Chris_T, May 24, 2002.

  1. Chris_T

    Chris_T 1/2 ton status

    Mar 17, 2001
    Likes Received:
    Saskatoon, SK
    I have an intermittent vibration in my driveline which only manifests itself when I let my foot off the gas or when I'm just feathering it in traffic. It's only there for a second and is most noticible during the transition from acceleration to when the load is let off the driveline. It became more apparent after my new driveshafts. Probably not axle-related; just had new bearings put in when I swapped to 4.56s, wheel bearings were ok. Drive shaft has a new CV and new U-joint. What's your best gurss? T-case output bearing?

  2. backlash

    backlash 1/2 ton status

    Oct 21, 2000
    Likes Received:
    Northern, VA.
    I made this mistake once! I did too much to the truck at one time and still have noty figured out the intermitent vibration ...

  3. 73k5blazer

    73k5blazer Unplug the matrix cable from the back of your head Premium Member

    Dec 28, 2001
    Likes Received:
    The Rustbelt
    These problems are difficult to diagnose because they could be one of several things. Anyhow, here's a list of what I've done in the past to cure these things:
    Driveshaft is out of phase. Try removing it and roatating 90 degrees. Of course with new shafts, there was is no starting reference.
    U-joint is slipping in it's holder, (This is the one that got me). Tighten it down, or if it's tight, replace the yokes. The yokes DO wear, especially if in its history someone drove to the point where one was turning in the holder because the cap cracked, or whatever. You can tell if this one is happening my removing the shaft and checking the u-joint caps, if they are shiny, something's wrong.
    Bad t-case output shaft bearing.
    Driveshaft is not balanced. Alot of people under estiamte this one. I've been in "Driveshaft shops" where they're idea of balancing is they're eye. No thanks, get your shaft balanced properly by a qualified shop with the right machine to do it.

    Hope it helps!


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