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Help me figure this one out!

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Sax Art, Jan 30, 2001.

  1. Sax Art

    Sax Art Registered Member

    Dec 12, 2000
    Likes Received:
    Western, Wisconsin
    I just noticed this last night on my way home from work.....

    My '91 has, what I can call, a "thunk" when ever I accelerate from a dead stop. The strange thing about it is that it doesn't happen right away, it happens maybe .75 second (3/4 of a second) after I hit the gas from a dead or near stop. It doesn't matter if I apply the gas lightly or HARD!

    I've already checked the obvious; ball joints, tie rod ends, etc.
    It does happen in 2-wheel drive, but happens more often or more strongly (loudly?) in 4-wheel drive.

    Could this be a bad U-joint in the front axle?

    my rig has 140,000 miles on it!
  2. Emmettology 101

    Emmettology 101 3/4 ton status Premium Member

    May 9, 2000
    Likes Received:
    Yes, I would check all of your u-joint and also you tranny and transfercase mounts. I had a loose tranny mount in a fullsize van once, and it actually sounded like a ball rolling in a box when you got on the gas from a stop.

    One last place to check is your pinion bearings. Grab the yoke with your hand and see if there is any play in your pinion.


    Mike [​IMG]
    See <font color=green>EMMETT</font color=green> -&gt; <A target="_blank" HREF=http://emmett.coloradok5.com>http://emmett.coloradok5.com</A>
  3. EDdaTREE

    EDdaTREE 1/2 ton status

    Feb 18, 2000
    Likes Received:
    Austintown, OHIO
    Believe me..Emmetology KNOWS about pinions..LOL!!! Check what Mike said and also think about leaf-spring bind..my springs used to make a wierd kind of noise like that as the body weight shifted from acceleration. Soak em with oil or wd-40 and see what happens.

    "I'm not stuck...I'm just exploring the depth and texture of this mudhole for a while"

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