Question: Strange bouncing feel in rear end?

[Devon]

Goin slow in traffic it almost feels like a flat tire, I can see the bed hopping up and down? Would that be axle wrap? I have all leafs and overloads still. No traction bars but clamped leafs. It's only when going real slow. Speed up and it doesn't do it no more? Can feel it more so now with stock wheels/tires now.


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[RedHotGMC]

Maybe an off balanced tire, or dented rim? If it did it at higher speeds I would think the tire has a bulge. Does it do it with different tires?

 

[Devon]

Well with the 20's on and 305's I did not really notice it..


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[LBZ]

Bent rim or an out of round tire. Or a tire with a bubble between the outer cap and the cords.
Or you were driving through the ditch when you were looking in the mirror!

 

[solored]

Check your rear shocks see if the bushings are gone, wiggle them side to side to see how much play is there, if there is a noticeable amount, loosen off the bottom bolt and see if the shock is even doing what its supposed...

I say this, because mine is doing the same, and my shocks (that are pretty much new) are done, need new ones.

 

[chevyburnout1]

Does this do this only after sitting for a while? Seen tires get flat spotted from parking for an extended period of time. But usually goes away after some drive time.

 

[Capt.D]

Look and see if the belts in one of the tires has shifted....it will look weird as heck...

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[jcstroker]

My 06 CCTV lbz truck does the same thing and my 02 hd 6.0 gas ccsb . Around 35-50 ish mph .

 

[Harbin_22]

U-joints maybe.

 

[1slomax]

mines real bad around 40-50mph tires and wheels are good

 

[jcstroker]

mines real bad around 40-50mph tires and wheels are good

Glad I'm not the only one lol

 

[juddski88]

Have Justin look at it....

 

[jcstroker]

i think im gonna try some different shocks ive been told it helps

 

[Devon]

I'm buying some rancho 9000xl shocks in another week. It may just be a wheel balanced poorly. Checked U joints. No play what so ever. My stock shocks are Beatin up a bit anyways. So we will start there.


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[Chevy1925]

mines real bad around 40-50mph tires and wheels are good

Glad I'm not the only one lol

its a well known problem. as soon as factory wheels are taken off and different ones are put on it becomes apparent. the best way to reduce it is to have your tire shop road force the tires if possible, make sure you have good/new rear shocks, and if it still bugs you and you have a full leaf pack get a set of sulastic shackles. Ive also heard the new style body mounts of the 08-up HDs put on the back two posts helps some as well.

it sounds like i talking about the common bounce you get on the freeway from the expansion joints but it all leads over to the 40-50mph bounce too.

 

[06_6.6]

Even though it was a half ton, I had gotten those shocks on my 96 Yukon all around after I had cranked the bars 2.5 inches and added a 2" block in the back. Ended up putting bilsteins on and those rode much better...

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