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James Keller
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truck rides rough and eneven

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I have a 2008 t660 and for as long as I can remember the truck rides very rough,you can feel every bump in the road and rr trax and such are very rough.Also if you look at the truck either from the front or the rear it seems to be leaning to the pass side when on even ground.It is not just the cab and sleeper but seems like the frame rail on the pass side is lower to one side.I was wondering if one thing had something to do with the other as far as ride and truck leaning.

Edited by: James Keller ( )

I think this ride and eneven look has something to do with the air in the bags because sometimes seems to ride good but then I will notice it rides rough again.I run the same route all the time so its easy to tell when truck is not ridding the same

James Keller,

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Kevin Halderman
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Have you changed the shocks? This includes cab shocks. Most shocks are shot after 50-75k. If you are heavy, 50k is more likely. All the OEM shocks on the market all cheap and generally junk. If you run 200 miles, get out feel the shocks, "dampening" generates heat, if they are cold replace them. Save the receipt so in 8 months you can get the warranty on them. After 4 years I never bought another shock. I just continue to get them re-warrantied.

So if your cab seems lower you could have a bad cab air bag. Measure you cab from the frame rail to cab to see the difference, If this is even, then measure the frame rail to the ground. Both sides in several places. You could have an bad air bag, spring, or bushing and this issue could be on the front or rear, but measuring will help to see which area/areas are lower. thus---start looking there. Any issue you have causing the cab/ truck to tilt, is major issue and a guaranteed OOS. So you need to get this looked at and fixed.

Also to much air pressure leads to a rough ride. Anything over 130psi (with regular operations) should get advice from the tire manufacture , not just a "tire shop."

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David Parent
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have your springs checked for cracked or missing leafs also check your leveling valve in the rear for the proper hight

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rossshearer
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My kenworth had two ride adjusters for the air suspension ,left and right if one is out it will lean more one way than the other ,there are slide adjustments on the leveling valves ,so find out from KW the correct ride height and just adjust them till its correct on flat ground with a load on.It will take some time and its a bit frustrating but worth it in the end

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Simon Turnbull
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Not sure if this will help I changed my shocks 2 weeks ago the front ones put on the King shocks. I have a 2005 volvo the ride had been horrible for 2 months the right shock was knackered what a diff after replacing very difficult to put on compared to the usual shocks it took about 2 hrs to replace them both. Huge difference it has made to the ride and feel of the truck they are expensive, if they last 400000 miles then they only cost .0017 cent a mile pretty cheap when you break it down. Going to put them on all round to see what diff they make.

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Chris Hileman
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I don't know what suspension system your KW has but check the bushings in the suspension. I recently replaced some bushings on my Freightliner and it improved the ride greatly. Also, do you know if the truck has been in a wreck? If it is leaning to one side, maybe the frame is twisted.

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