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.

Strange sticking clunk when starting or stopping!

Discussion in 'The Garage' started by Kiqman, Mar 11, 2006.

  1. Kiqman

    Kiqman 1/2 ton status

    Joined:
    Dec 14, 2004
    Posts:
    102
    Likes Received:
    0
    Location:
    Portland Oregon
    I haven't changed anything in the suspension. I recently had my u-joints replaced. When I step on the gas from a stop it feels like the rear end has to break loose before I start moving. If I'm stopped and I let off the brake the truck begins to smoothly roll forward. As soon as I step on the gas I feel the rear break loose somewhere and then I'm on my happy way. When I come to a stop the sticking clunk happens again right as the vehicle rocks to a complete stop. Everything seems tight under there and the rear end makes no noise and shows no slop? I've had the wife start and stop 20 times while I walk along outside the truck. I can't pinpoint where the sticking clunk is taking place but you can kind of see the whole rear end jolt ever so slightly when she hits the gas or slams on the brakes.
     
  2. goldwing2000

    goldwing2000 Guest

    Sticking/misaligned slip joint?
     
  3. Kiqman

    Kiqman 1/2 ton status

    Joined:
    Dec 14, 2004
    Posts:
    102
    Likes Received:
    0
    Location:
    Portland Oregon
    Slip joint...is that the sliding joint in the driveline?
     
  4. goldwing2000

    goldwing2000 Guest

    Yup. Either as a slip yoke into the transfer case or a slider right in the driveshaft.

    As you accelerate and decelerate, this should move in and out freely. If it's sticking, you could get a clunk.
     
  5. Kiqman

    Kiqman 1/2 ton status

    Joined:
    Dec 14, 2004
    Posts:
    102
    Likes Received:
    0
    Location:
    Portland Oregon
    I'll have to check out the slip joints then. If they're misaligned it means my drive line is bent right? It shouldn't be because it's almost brand new and I haven't even had it off road yet. I'm hoping it's just sticking - which I should be able to fix with some grease through the zert right?
     
  6. goldwing2000

    goldwing2000 Guest

    You might have to pull it apart and clean it before you can regrease it, but yeah.

    Misalignment doesn't necessarily mean it's bent. If the splines are keyed to only go a certain way and they aren't in the right spot, that can cause bad things to happen. Also, make sure the u-joints at either end are in phase. That means they are 90° to each other.
     
  7. hack500

    hack500 1/2 ton status

    Joined:
    Sep 16, 2005
    Posts:
    523
    Likes Received:
    0
    Location:
    Templeton, Ma
    I'm going to be completely different and say it's the rear brakes that just coincidentally started doing that at this time.
     
  8. diesel4me

    diesel4me 1 ton status Premium Member

    Joined:
    Jul 24, 2003
    Posts:
    17,537
    Likes Received:
    922
    Location:
    Massachussetts
    All of that,and...

    A broken tranny mount,worn tailshaft bushing,or driveshaft yoke that slides into the tranny can cause clunks and binding on starts and stops..also loose "U" bolts,shock bushings,leaf spring bushings,sheared center bolts,and possibly even worn spider gears..if you see the rear end housing moving,its probably the "U" bolts or spring related..good luck,nearly all of my GM trucks I've owned had a "clunk" after letting off the brakes after a quick stop..:crazy:
     
  9. AZ79K5Project

    AZ79K5Project 1/2 ton status

    Joined:
    Jan 15, 2006
    Posts:
    2,082
    Likes Received:
    0
    Location:
    Arizona
    Loose transfer case mounts, transmission.

    Check the brake calipers. I had a clunk that I could not pinpoint. I found what the noise was when the bolt loosened and came out as I was stopping. The caliper lodged against the wheel. Stuck in the lane.
     
  10. Kiqman

    Kiqman 1/2 ton status

    Joined:
    Dec 14, 2004
    Posts:
    102
    Likes Received:
    0
    Location:
    Portland Oregon
    It wouldn't be the first tranny mount I've busted with this new motor. My tranny leaks like a stuck pig and the last time I had the leak fixed they told me there were bolts broken or missing. I'm guessing it's not in the rear brakes as the braking works great and the clunk is much more substantial, like the ring and pinion are binding on start and stop. Could be the spring bushings cuz they look like hell. U-Bolts are torqued down tight but I would like to ditch the 3" blocks they're sitting on. The whole underside of this bastard needs replaced - from the ball joints to the rear spring bushings to the body mounts. Loving a 20 year old truck is hard to do.
     
  11. Scrubby

    Scrubby 1/2 ton status

    Joined:
    Dec 1, 2001
    Posts:
    114
    Likes Received:
    0
    Location:
    Boise, ID
    I had a similar noise when my leaf spring bushings were shot.
     
  12. Chaddy

    Chaddy 1/2 ton status GMOTM Winner

    Joined:
    May 23, 2005
    Posts:
    4,110
    Likes Received:
    2
    Location:
    Salt Lake City,Utah
    Sounds like U-bolts, brakes, or body mounts.
     
  13. black'burb

    black'burb 1/2 ton status

    Joined:
    Mar 11, 2005
    Posts:
    182
    Likes Received:
    0
    Location:
    Northeast WA
    My Cherokee was doing the same thing. Changed out the drum brakes (they were bad) turned the drums and no more clunking.....my .02
     
  14. goldwing2000

    goldwing2000 Guest

    Well, there's lots of ideas for ya. Be sure to check back and tell us what you find!

    Nothing worse than leaving us all hanging. :D
     
  15. Kiqman

    Kiqman 1/2 ton status

    Joined:
    Dec 14, 2004
    Posts:
    102
    Likes Received:
    0
    Location:
    Portland Oregon
    I believe it's a combination of worn out rear drum brakes and spring eye bushings. I'm going to replace the bushings and re-shoe the brakes. The driveline was out when I replaced the u-joints so I don't think it's the slip joint. More to follow after next week's eye bolt battle.
     

Share This Page