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  1. #1

    Default Bed shakes some at 40-45mph since i had the lift put on?????

    Hey guy's i was wondering what is causing my truc bed take shake around 40-45mph?Anything before or after that speed there is not shaking what so ever and i didn't notice this until i put the lift on.. what could this be if anyone knows and how could i fix this..???

    2008 Chevy Silverado Ext. Cab Lt Z71 5.3 V8
    7.5 Inch Rough Country Suspension Lift
    RBP Replica Grille Black w Chrome Rivets
    Recon Smoked Cab Roof Lights
    N-Fab Powdercoated Gloss black Cab Length Nerf Steps
    5% Tint over 20% all the way around / 5% Eyebrow Strip
    AVS Smoked Window Visors
    Z71 Stickers Black & Metallic Silver
    Tow Mirrors / Smoked Turn Signals
    XM Satellite Radio Fin / Color Matched
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    Painted Door Handles / Color Matched
    Smittybilt Bull Bar / Color Matched
    Custom Rolled Edge Exhaust Tips / Color Matched
    Custom 2.5 Inch Cat Back True Dual Exhaust
    Flowmaster Super 40 Series Dual in / Dual out
    Magnaflow Tru-X Pipe
    K&N Air Filter
    18x9 Rockstars Machined Black
    Center Caps / Color Matched
    33.13.50 Nitto Terra Grapplers
    New Front Wheel Well Liners
    Eagle Eye Black L.E.D. Tailights
    Eagle Eye Black L.E.D. Third Brake Light / Smoked
    Eagle Eye Black L.E.D. Halo Projector Headlights
    Notto HID Kit 10,000k Low beams
    Recon L.E.D. Light Bar
    Buschwacker OE Style Tailgate Cap
    AMI Gloss Black Antenna
    Debadged Chrome Lettering
    Door Molding Removed

  2. #2
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    murdog94's Avatar
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    Check all of the bed bolts would be my first stop since its not to uncommon for things to either work loose or break when it comes to beds.
    Mike

    Currently

    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

  3. #3

    Default

    This could be the result of a number of things including tires or the result of the lift. I would recommend starting by taking the vehicle back to where you had the lift done. They should be able to assist you further and have a plan for addressing the issue. Please feel free to keep me updated with any further developments. Thank you again and I look forward to hearing from you.

    Tricia, GM Customer Service.

  4. #4

    Default

    When you put the lift on the year, did you make sure to torque all the bolts to spec, and do it again 250-500 miles later? The shaking you're experiencing could actually be the whole rear of the truck wobbling from a loose bolt that's about to let go. Double-check all your bolt torques.
    Christopher

    1991 Chevy Suburban 1/2 ton 2WD w/ chevy SBC 350-3/4 ton drivetrain upgrade w/4.10 gears 200K miles
    2005 Saturn ION-2 Stock 277K miles
    1982 Bronco, 1993 Bronco (sold), 1971 M35A2 Deuce and a Half



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  5. #5

    Default

    X2 ,check and retorque all the nuts and bolts that were used with the lift kit after 500 miles. Torque to SPEC!

  6. #6

    Default

    yeah i havent had that done that might be the problem i might ask my buddy's to tighten them for me quick one day thanks guy's.

  7. #7

    Default

    you might also have a balance issue on one of your rear tires...i had a weight come loose once and had a shake at 55 only, then it went away...just a thought...weirder things have happened...good luck...
    Mike - SoCal

    07 Sierra 1500HD
    Ultra Mammoth Wheels 17x8
    Nitto Terra Grapplers - 305/70/17
    Line-X Bedliner and Wheel Wells
    NFab Nerf bars
    CST 4" Spindle lift


    08 Hybrid Tahoe - wifey's ride
    McGaughy's 2/3 drop kit
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    Nexen Roadians 285/45/22

  8. #8
    Master Mechanic clgoch187's Avatar
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    Default

    did you ever get an alignment after the lift was installed?
    03 Silverado 1500
    285/75/16 BFG's
    2 Blaupunkt 10" vW1000 subs in Subthump box
    ProComp Level Lift & 3" rear blocks

  9. #9
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    stephan's Avatar
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    X2 on the above sugesstions, & also depending on how much you lifted it this has changed your driveshaft angle & put more strain on your U-joints which will cause vibration to show up where you didn't have it before. If this is your problem, it can be cured by putting tapered shims in the rear between the springs & the spring pads on the axel housing, to change the angle of the rear axel housing & decrease the D S angle back to what it was.
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol


  10. #10
    Sr. Apprentice Pflor86's Avatar
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    Quote Originally Posted by mad1500hd View Post
    you might also have a balance issue on one of your rear tires...i had a weight come loose once and had a shake at 55 only, then it went away...just a thought...weirder things have happened...good luck...
    Thats what i was thinking ... big tires are a little more difficult to balance. i also have had to re balance a tire because of shaking...........hope its just that simple if you do a lot of mudding its very possible to have lost a weight

    08 silverado z71
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    35"nittos 20" rockstars
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