GM Truck Club
THE PREMIER CHEVY TRUCK & SUV FORUM
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Results 1 to 10 of 10
  1. #1

    Default crazy vibrations

    whoa! maybe some one can help me out here.. i have a 2000 silverado ls with a long bed. its an ex-work truck that i picked up cheap. the problem is that it shakes at highway speeds. at about 65mph the pasanger seat visibly shakes and you can feel it through the whole cab. i had the wheels ballanced, i had a front end allingment, i switched the wheels thinking that maybe one was bent, i got new tires thinking one might be "cupped" (and they were worn out anyway). i cant figure it. it seems to be coming from the rear of the truck. should i replace suspension components? also, the bed sags towards the drivers side. this seems to be a problem with a lot of chevys. whats up with that? someone help me out please?

  2. #2
    Jr. Engineer hundojoe's Avatar
    Join Date
    Feb 2010
    Location
    Elk River, Minnesota
    Posts
    210

    Default

    Try replacing the shocks, Does the truck have stock size tires?
    1999 Silverado Regular Cab Short Box
    Black on Black, Line-X sprayed in bed liner
    5.3 with K&N CAI, Texas Speed 220/220 cam with 112 deg LSA
    Texas Speed computer Tune
    American Racing Headers with Cats
    4.11 gears front and back, with Eaton rear posi
    Flowmaster 40series true duals
    16X8 American Racing Nitros with 305/70/16 Goodyear MTR's
    285's in the pic



    If it ain't broke...........Give me a minute!

    Im not completely useless, I can be used as a bad example...

  3. #3

    Default

    yes, stock size. 16.5 or 16. 136000 miles. dont know if the shocks have ever been replaced

  4. #4
    Jr. Engineer hundojoe's Avatar
    Join Date
    Feb 2010
    Location
    Elk River, Minnesota
    Posts
    210

    Default

    Definitely not 16.5's, Well start by changing the shocks, I prefer Rancho shocks, but there are alot of good manufactures out there.
    1999 Silverado Regular Cab Short Box
    Black on Black, Line-X sprayed in bed liner
    5.3 with K&N CAI, Texas Speed 220/220 cam with 112 deg LSA
    Texas Speed computer Tune
    American Racing Headers with Cats
    4.11 gears front and back, with Eaton rear posi
    Flowmaster 40series true duals
    16X8 American Racing Nitros with 305/70/16 Goodyear MTR's
    285's in the pic



    If it ain't broke...........Give me a minute!

    Im not completely useless, I can be used as a bad example...

  5. #5
    Jr. Apprentice
    Join Date
    Sep 2010
    Location
    Inland Empire
    Posts
    15

    Default

    Hey sorry your trucks giving you so much trouble. High way speeds usually indicate a out of balance tire, since you had them balanced and they didnt mention a bent rim or seperating tire i would next check to see if your rims are stock. After market rims sometimes dont center right on the hubs. Then take a floor jack and raise each wheel and move it back and forth, up and down checking for abnormal play in the hubs, ball joints, ect... BUT BEFORE ANY OF THIS TAKE IT BACK TO THE SHOP YOU BOUGHT THE TIRES.
    As for the sag. Hopefully its just body mounts, but on alot of long beds they get overloaded at some point and the frame bends.-Good luck

  6. #6

    Default

    Quote Originally Posted by MANBEARPIG View Post
    Hey sorry your trucks giving you so much trouble. High way speeds usually indicate a out of balance tire, since you had them balanced and they didnt mention a bent rim or seperating tire i would next check to see if your rims are stock. After market rims sometimes dont center right on the hubs. Then take a floor jack and raise each wheel and move it back and forth, up and down checking for abnormal play in the hubs, ball joints, ect... BUT BEFORE ANY OF THIS TAKE IT BACK TO THE SHOP YOU BOUGHT THE TIRES.
    As for the sag. Hopefully its just body mounts, but on alot of long beds they get overloaded at some point and the frame bends.-Good luck
    x2

    also check out the drive shaft, if bent or out of balance can vibrate as well. check ujoints. Bilsteins are another good shock brand
    David
    2004 Silverado 2500 Crew Cab 4x4, AMSOIL EA air filter, Granatelli MAF sensor, Throttle body spacer, Magnaflow exhaust (true dual to 2 in 1 out muffler), 6" ProComp lift (add a leaf and 5" superlift rear block), Bilstein shocks, 35's (Cooper Disoverer ST) and 4.10 gears, Rhino Liner, EGRUSA fender Flares and widow visors, extended stainless steel brake lines, firestone airbags w/onboard air compressor, Pioneer Avic X940BT navigation, Accel backup camera.
    http://www.gmtruckclub.com/forum/sho...Silverado-2500
    1960 Land Rover Series II 88
    2001 Pontiac Sunfire
    2013 Toyota Avalon Limited (Wife's Car)
    NRA Life Member

  7. #7

    Default

    Quote Originally Posted by dsfloyd View Post
    x2

    also check out the drive shaft, if bent or out of balance can vibrate as well. check ujoints. Bilsteins are another good shock brand
    Hmm. here is something else kinda related to ther drive shaft.. i replaced the transmission mount because it was detoriated. it bolted to the transmission just fine but the bolt did not line up with the hole in the frame crossmember. i had to wedge a small jack and a block of wood between the frame and transmission and push it over so it would line up. does ths indicate that maybe the drive shaft/ rear axel are not perpendicular with the front of the truck? it was vibrating before and after i did this. i havent checked the u bolts. am i checking to see if they are loose?

  8. #8
    Jr. Apprentice
    Join Date
    Sep 2010
    Location
    Inland Empire
    Posts
    15

    Default

    Yes you are checking for any play at all in the drive shaft and having to manipulate the mount to get it in the hole is not unusual.... this is a tough one to figure out, usually u joints are accompanied by a cluck. More likely bent drive shaft.
    Last edited by MANBEARPIG; 09-24-2010 at 05:40 PM.
    "if i had eight hours to chop down a tree, I would spend the first six sharpening the ax."-Abraham Lincoln

    Gary ASE certified master tech
    94 k1500 33" tires Hummer rims
    NINJA 600

  9. #9

    Default

    Ok, i changed the shocks and it still vibrates. i checked the u bolts. they seem to be ok. i called around to local mechanics and there is only one place in town that ballances drive shafts.. my wheels are ballanced... could it be worn out bushings? maybe the leaf spring bushings?

  10. #10

    Default

    bump. I'm looking for an answer also

Similar Threads

  1. Bad vibrations in an oldskool K10
    By rebelpride in forum Lifted & Offroad Suspension
    Replies: 0
    Last Post: 08-02-2010, 06:13 PM
  2. weird vibrations 1999 suburban
    By ikemoney in forum Chevy Suburban Forum (GMC Yukon XL)
    Replies: 2
    Last Post: 02-03-2010, 11:19 PM
  3. Tell me I am crazy
    By LisaO925 in forum Chevy Suburban Forum (GMC Yukon XL)
    Replies: 3
    Last Post: 05-18-2009, 11:36 AM
  4. weird vibrations
    By cocacolamanjosh1984 in forum General Chevy & GM Tech Questions
    Replies: 1
    Last Post: 09-14-2008, 09:56 PM
  5. New Here and Maybe Crazy
    By Rumbles in forum The Coffee Shop ~ Chit Chat
    Replies: 11
    Last Post: 01-23-2008, 07:53 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •