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Bouncing in rear

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Old Apr 22, 2021 | 05:26 PM
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Bouncing in rear

08 f250 with 6" lift on 37s. i have put in brand new nitto G2 all terrain tires, new rims, new bilstein shocks, new steering stabilizers, tie rods, etc, but the SOB still bounces every timei drive on any road/ highways uneven or slight bumps as if the tire looses cintact with the road a few times and then smooths out again. What can it be? any idea? thank you
typo
 

Last edited by Dieselcyrus; Apr 22, 2021 at 05:28 PM.
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Old Apr 22, 2021 | 05:39 PM
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What air pressure are you putting in your tires? I would try backing it off 10-15Lbs below the recommended pressure.
 
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Old Apr 22, 2021 | 06:21 PM
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Originally Posted by Gyppo Logger
What air pressure are you putting in your tires? I would try backing it off 10-15Lbs below the recommended pressure.

well i called NITTO and they calculated the psi and told me 50 psi. i took it down to 46 so i guess take it down to 40??? i Used one formula i found on Google that said 42....so i guess 46 is too much
 

Last edited by Dieselcyrus; Apr 22, 2021 at 06:22 PM. Reason: typo
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Old Apr 22, 2021 | 06:45 PM
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When I drive on dirt roads I air my tires down to 50 PSI and it makes a huge difference otherwise it beats me to death at 80 PSI (stock tires, empty truck).
 
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Old Apr 23, 2021 | 08:02 AM
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I purchased a set of tires shortly after I purchased my truck. I really did not notice or can I recall if it had the bounce in the rear before the new tires. But shortly after the new tire install it had a bounce in the rear b/w 40 and 45mph. So annoying! I had the tires wheel/ tire matched, road forced balanced, even driveshaft balanced. sometimes it would smooth out after a balance and rotation, sometimes not. I just dealt with it. I have even read on this site that the bounce is just part of a long bed characteristic. Recently I had a new set of different brand tires installed by the same shop where the others came from and who does all the maintenance on my vehicles. Voila, the bounce is gone, truck is as smooth as silk. So, it may be the tires.
 
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Old Apr 23, 2021 | 08:05 AM
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What springs are you running in the rear? Spring rate could be too high for an unloaded truck.
 
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Old Apr 23, 2021 | 08:37 AM
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There are a LOT of things that contribute to 'beam shake' as it used to be known. If you've got a long box truck it's going to be worse than a short box truck. You've also lifted it, which doesn't help the issue. Deflating the tires can help but not always, and even if the tires are perfectly balanced you may not get rid of all of it.

Usually what helps is to put some weight in the bed. Just a couple bags of sand might be enough, right between the fender wells. This will help put some pressure on the springs and keep them from bounding.

If that DOESN'T help and it is truly a tire issue, you could try Centramatic wheel balancers. They go between your brake rotor and your wheel, and help take out imbalances. I have not used them myself (though I am considering it), but I have heard people have had very good luck with them.
 
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Old Apr 23, 2021 | 11:59 AM
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Originally Posted by bajaphile
What springs are you running in the rear? Spring rate could be too high for an unloaded truck.
just the original stockleaf springs
 
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Old Apr 23, 2021 | 12:02 PM
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Originally Posted by 99powerstrokedF250
There are a LOT of things that contribute to 'beam shake' as it used to be known. If you've got a long box truck it's going to be worse than a short box truck. You've also lifted it, which doesn't help the issue. Deflating the tires can help but not always, and even if the tires are perfectly balanced you may not get rid of all of it.

Usually what helps is to put some weight in the bed. Just a couple bags of sand might be enough, right between the fender wells. This will help put some pressure on the springs and keep them from bounding.

If that DOESN'T help and it is truly a tire issue, you could try Centramatic wheel balancers. They go between your brake rotor and your wheel, and help take out imbalances. I have not used them myself (though I am considering it), but I have heard people have had very good luck with them.
awesome suggestions, makes lots of sense. i have over 10 sand bags in my garage ill throw a few in the back each are 30lbs and i go ahead amd deflate down to 42 psi and aee if it get better. thanks man.
 
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