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Thread: 2018 RAM 2500 - Bump Steer/Vibration Issues

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    18ram67's Avatar

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    2018 RAM 2500 - Bump Steer/Vibration Issues

    I have an 18 2500 crew cab reg bed 82k miles that I have installed a Carli leveling kit, Carli track bar, synergy drag link (possibly switch those).

    I just bought some Mikey Thompson Baja boss at 35x12.5r20. I have aftermarket ultra rims.

    I have some vibration issues at highway speeds 65+ and some bump steer problems.

    It doesn't seem to happen while hitting cracks in the roads but more hitting road "humps."

    Does anyone have any current ideas?

    I've read the prior posts from a while ago, but the links are no longer functioning.

    It seems the ideas are a horse apiece.

    I am open to some suggestions, and I have a hunting trip I have to drive 15 hrs to get to soon.

    Thanks.

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    DDP's Avatar

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    Re: 2018 RAM 2500 - Bump Steer/Vibration Issues

    Bump steer can generally be helped by installing an excellent stabilizer.

    The vibration can be many things. Just about every wheel/tire is not valid.

    It could be that, and they need to get some miles on them.

    I could also need a re-balance, possibly from the tire shop.

    It could be a few different things, and this issue is not the easiest to figure out without having the truck.

    Holler at us if you have any questions, though, my friend!

    Thank you,
    Clayton

    Matthew 6:9-13, 2 Corinthians 5:20
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  5. Top Of Page | #3
    18ram67's Avatar

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    Re: 2018 RAM 2500 - Bump Steer/Vibration Issues

    Carli makes them.

    I am looking at them now.

    Do I need a high and low, or can I get away with just replacing the stock one until I get the Carli set up I want in 6ish months?

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  7. Top Of Page | #4
    DDP's Avatar

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    Re: 2018 RAM 2500 - Bump Steer/Vibration Issues

    We can get you set up with a replacement that will work.

    If you want the Carli one, we can do that as well.

    A lot of our customers go with a Fox TS or ATS stabilizer with excellent results.

    The hard part is finding them, LOL.

    Please shoot me an email when you can so I don't lose your messages.

    clayton@ddpmotorsports.com

    Matthew 6:9-13, 2 Corinthians 5:20
    See what we are up to on:
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    Or Email us at:
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    www.ddpmotorsports.com


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    DIESELWRKS's Avatar

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    Re: 2018 RAM 2500 - Bump Steer/Vibration Issues

    What ply of tires and what PSI are you running.

    If I don't have my tires, 35" AT at 45 is psi.

    I get a vibe that is awful on the freeway.

    If you mess around with the psi, If it doesn't get better.

    Then balance again.

    If that doesn't help or you notice a slight improvement

    Ask for a (road force balance).

    Ten years ago, the Mikey Thompsons were a bugger to balance.

    Did this vibration start after the tires?

    Did you get the wheels too?

    If they are new, is this the first time with 20" wheels?

    2017 WON TON CC LB 68AUTO
    Secret stuff that make it vroom and whistle better Thuren 2.25 w/2.0 Fox Resi

    Justin
    Southern Oregon ( the Republican part)
    UNITEDSTATES MARINE CORPS 1993-2007
    No better friend, No better enemy.

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  11. Top Of Page | #6
    18ram67's Avatar

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    Re: 2018 RAM 2500 - Bump Steer/Vibration Issues

    Quote Originally Posted by DIESELWRKS View Post
    What ply of tires and what PSI are you running.

    If I don't have my tires, 35" AT at 45 is psi.

    I get a vibe that is awful on the freeway.

    If you mess around with the psi, If it doesn't get better.

    Then balance again.

    If that doesn't help or you notice a slight improvement

    Ask for a (road force balance).

    Ten years ago, the Mikey Thompsons were a bugger to balance.

    Did this vibration start after the tires?

    Did you get the wheels too?

    If they are new, is this the first time with 20" wheels?
    Wheels are not new, 2ish years old.

    The truck came stock with the 20s - I'll be going to 17 at some point.

    The vibration was with the Toyo at3 as well.

    I was running 65/55.

    Had the truck aligned - the guy said he wouldn't touch anything; alignment isn't an issue.

    I had them rebalance, and they keep putting in sticker psi.

    When I do the road force balance, do I need to fight to have them complete it with the pressures I'll be running, or does it not matter?

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  13. Top Of Page | #7
    18ram67's Avatar

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    Re: 2018 RAM 2500 - Bump Steer/Vibration Issues

    I should also say, I don't feel the vibration in the steering wheel.

    It's in the seat.

    The last set of tires I had were Toyo AT3.

    I had the vibration with those too, but it wasn't until the very end, if I remember.

    Now it's more dramatic with the Mickey Thompson bb at.

    I do notice the vibration is not the same amount constantly.

    Sometimes at 80, the vibration is more than other times at the same speed.

    With that said, everyone makes comments about how soft the Mickey Thompson compound is.

    Does this mean there's a better-suggested psi than, say, the Toyos?

    Also, I got the tires from discount tire. Do they have a way to test the tire for being out of round?

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    DIESELWRKS's Avatar

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    Re: 2018 RAM 2500 - Bump Steer/Vibration Issues

    Try dropping your psi, you can also do a chalk test.

    You can also Google Chalk test tires and this is a time consuming test.

    Start out with a high psi tire. as this will save time as you will only need to drop psi instead of adding. If you do do this drive first and get the tires warm.

    My psi reads 41 cold and after driving and freeway it's around 45 to 47psi.

    The tire shop always wanted to put my psi close to max load rating of 75to 80.

    This was great for fuel economy but was way to stiff and harsh.

    The feeling I get is a cyclic vibration felt in seat and passenger seat if I reach over and feel.

    On all of the tires I have had on this truck and past cummins trucks I have done a chalk test
    My front psi I find best for my current tires
    Cooper at3 xlt 35" with a 18" wheel
    45 front. 35 rear.

    This is for empty not towing or hauling heavy.

    Daily driving.

    Road force balance.

    In a nut shell and my lack of better explaining.

    A roller is used and applies like 1300 lbs of force to act as a load force as if tire was on the road.

    This due 6o a bunch of sensors it can detect defects in tire, runouts, belt defects , flat spots and tires thst are out of round.

    When a tire is initially mounted its lined up
    From a spot on the tire as a marker for what factory says is dead center and that is lined up on a spot on the wheel (don't know what that is called) The tires new usually have a color spot painted on tire.

    My last set of tires nitto ridge crapplers.
    We're very rough and hard to balance. Always fought a vibration anything over 50.
    Around 10k miles on tires I had the shop do a road force test.

    They ended up reclocking the tires almost 180 degree spin from where they originally were mounted on the wheels.

    This took away like 95% of all vibration felt.

    My tire shop big I.

    Did the road force test free.

    If discount tire does not have a machine to do that.

    Talk to them.

    Tell them the concerns and issues you are having.

    Maybe they would cover the cost if the road force test results are that significant.

    That means there were issues regardless with the tires they sold.

    Usually shops charge 20-25 a tire for road force test.

    I think you asked about changing psi after a reg balance or road force test.

    Yes you can change your tire psi based on your needs.

    But First for free use a good hand held tire pressure
    Guage the factory display can be accurate but not right away. Drop your psi up front to 60 and drive.
    If it starts to get better but still there. Drop to 45 etc.
    Rear I would guess 35 to 40 .
    If you have a long bed dropping the rear will help with
    The rear almost like a buck or slap feeling.
    Having 20" wheels and smaller stiff sidewalls like you have add a high psi in your tires as the tire shop put in
    Gives a rough less forgiving tire.

    I'm not sure if you have heard or know of thuren
    Fabrication suspension.
    Don thuren on his website gives a lot of good info education on dodge suspension and alignment specs
    He also has done a bunch of you tube videos
    Which one he explains a chalk test and how to do it.

    So a few free things to do yourself before going down the road and doing a road force.
    Maybe finding proper or best psi will solve it
    Or you may have bad tires which happens and a road force would help determine thst.
    Hope this helps some, sorry to all if my lack of proper words or explain all this. Please feel free
    To correct or add to this thread.
    This is the reason we are all here to help
    Our cummins community.

    Justin

    Forgot to ask. Do you think you are having but steer
    This is usually when you are going straight
    His a bump and then wants to pull to one side.
    Various parts on steering linkage worn could cause but if your alignment guy said parts are good

    steering Stabilizer is a damper designed for your steering. Damper’s purpose is to increase steering predictability, minimizing volatility, some road noise

    The factory shock stabilizer is a very poor crap part.
    I recently installed my thuren lift
    And I don't have bump steer but I do and will upgrade
    To a better one from thuren, but they are currently out of stock.

    Last edited by DIESELWRKS; 11-14-2021 at 07:42 PM. Reason: Add
    2017 WON TON CC LB 68AUTO
    Secret stuff that make it vroom and whistle better Thuren 2.25 w/2.0 Fox Resi

    Justin
    Southern Oregon ( the Republican part)
    UNITEDSTATES MARINE CORPS 1993-2007
    No better friend, No better enemy.

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