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Suspension 3rd Gen Dodge Ram Suspension Problems and Questions


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  #1  
Old 02-28-2011, 10:36 AM
bvbellomo bvbellomo is offline
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Default Shaking above 50MPH

I just bought a used 2006 5.7 Hemi TRX4 1500 Regular cab. It is a very smooth ride up to 50mph. Above 50mph, it shakes, sometimes a little, sometimes a lot.

Shaking does not appear related to road condition - roads in Ohio are bad, and if I hit a bad spot it obviously shakes but goes back to a smooth ride as soon as I get back to smooth pavement. Other times, the road will be smooth (at least for Ohio) but it will shake badly.

This did not happen when I test drove the vehicle, but I didn't take it above 50mph for long and it is possible the problem existed but I did not notice. Between the test drive and driving home, the dealer replaced tie rods, rotated tires, and did an alignment. It is possible that caused the problem.

I am assuming this is a suspension issue, and it seems located on the front left of the vehicle. I am not certain - it could be drivetrain, wheels, or a different part of the suspension.

Any ideas how to troubleshoot this?

Someone on another thread suggested shifting into neutral at high speed to rule out drivetrain issues. Is that safe? Do I need to completely kill the engine, or will shifting into neutral and idling the engine rule out drivetrain issues?
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Old 02-28-2011, 03:46 PM
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no danger shifting into neutral at any speed(im not an engineer but have done it many times drafting behind big trucks downhill)sometimes changing your tires from front to back will eliminate bad tire(belt shift) becuase it will feel different. does shake feel like it is coming thru your steering wheel? so many things can cause vibration from small bend or defect in drive shaft.mr.transmission in canada gives your free diagnostic on those type problems maybe some place around you does the same.
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Old 02-28-2011, 04:01 PM
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using neutral while going over say 30 MPH, could tear up your transmission, if you do it for any distance, like say a couple blocks

I would think that a wheel weight or 2 came off, or the drive shaft is out of balance

have a real tire shop run a ROAD FORCE BALANCE, the shop would need a Hunter GSP9700 Road Force measurement balancer, to do it

I let the dealership do it, they charged me $54 just for wheel weights & more for Labor charges
next time i will go to Discount Tire
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Last edited by GTyankee; 02-28-2011 at 04:06 PM.
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Old 02-28-2011, 04:20 PM
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sorry about the bad advice on shifting into neutral.i thought that it wasnt a problem but looked it up and apparently it can cause lack of lubrication on some transmissions something to do with vacuum when it is not in gear. i have done it on numourus vehicles coasting thinking of consuming less gas.not all backyard mechanics have good advice...
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Old 02-28-2011, 05:06 PM
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Speed related vibration almost always is wheel/tire related. More often than not it is simply a wheel balance issue. Possibly an tire separation issue and rarely a wheel defect issue. Is the vibration in the steering wheel or more felt in the floor/seat of your pants? That can narrow your search significantly. Also, does the vibration go away at higher speeds? Usually a tire/wheel vibration starts at 45-55 and goes way about 75-80MPH.
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Old 03-01-2011, 05:09 PM
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I will try to answer everyone's questions next chance I get to drive freeway.

How do I go about getting a Hunter GSP9700 Road Force balance? I called a few places and they said it isn't needed and they want to do a regular balance. I'd rather pay to have a GSP9700 Road Force balance, as if it still shakes, I can be confident it isn't a wheel/tire issue.
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Old 03-01-2011, 05:30 PM
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Quote:
Originally Posted by bvbellomo View Post
I will try to answer everyone's questions next chance I get to drive freeway.

How do I go about getting a Hunter GSP9700 Road Force balance? I called a few places and they said it isn't needed and they want to do a regular balance. I'd rather pay to have a GSP9700 Road Force balance, as if it still shakes, I can be confident it isn't a wheel/tire issue.
Guys who say you don't need it, don't have one. You could try calling Hunter and asking if they know of any tire dealers in the area with their equipment or just keep calling around till you find one. They are considerably more expensive than standard wheel balance machines so probably higher end/larger shops are going to have them. Many dealerships have them as well.
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Old 03-01-2011, 05:37 PM
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If there is a "soft spot" in the sidewall it can feel like a flat spotted wheel. This happens if the tire sat for a long time without moving (not every case is this reason), and is called radial force vibration.
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Old 03-01-2011, 05:43 PM
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My vote goes to getting a ROAD FORCE BALANCE.

I chased a vibration at around 48 - 57 mph, then it would go away, then back at around 62 with no end no matter how fast I went.

We swapped out a rear u-joint, the driveshaft intermediate carrier bearing. No help. Then we put a well balanced set of stock wheels and tires on the truck...voila! Smooth as silk.

So I got the road force balance done to my KMC wheels/Toyo tires and no problems since.
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Old 03-02-2011, 07:55 AM
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I have this vibration too. It does feel more like its in the steering wheel and it's only between 62-68 mph.

I've checked my air in the tires and will be visiting the dealer to do the balancing today or tomorrow.

I've got to get this sorted out before my Bilsteins arrive in the mail.
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