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I am a first time Dodge Ram owner having purchased an 03 Ram 1500 Quad-Cab 4x4 with the Hemi engine... had 81K miles and completely clean carfax..let me describe this issue...

At 40 mph you can feel a shimmy in your seat, but not in the steering or brakes...when you look in the rear view it looks like the bed is hopping in an up and down pattern with somewhat a left to right shimmy from 0-38mph, nothing is felt

Once you past 40MPH the shimmy goes away, then picks up again, but worse at 55mph, peaks at 60mph and starts to go away once you hit 65mph and up... When your running 55-60mph, you can turn your wheel left to right slowly from the 12:00 position to 1:00 and back to 11:00 and feel a hop or shimmy in the steering, but this CANT be felt at the 40MPH mark...

So far outside of purchasing truck in March, I have done the following work:

new Firestone Destination LE2's road forced balanced on factory chrome steel wheels, and the Firestone dealer said the wheels look good, no bad wobble and very little wheel weights were needed to balance tires

new Monroe shocks, all new rotors, all new pads premium from Napa, center shaft replaced in front axle, right side CV shaft replaced as it had about 2" of circular play, and complete alignment.

Mechanic stated the upper and lower control arm bushings are cracked a bit, but there is no play in them to cause this issue

He checked the universal joints on front and rear drive shaft, says they are fine, checked front sway bar/stabilizer bar bushings, said their fine, he said rack and pinion unit is fine, said tie rods and ball joints are fine, so I am at a complete loss where to look. I was on a limited budget when I purchased this truck and had to eat almost an additional 2300 worth of parts, labor and tires.

Weird thing is that original owner said truck was drove from Missouri to Texas 2-3 times a month to visit family and no vibration was felt that she noticed...truck was only at wholesaler for a week before it was purchased at an auction by the dealer I purchased from and brought to Nashville TN.

Would appreciate any help...this is not causing any safety issues that I know of, but it's just aggravating and annoying!!! I have had nothing but GM trucks in the past, with no issues at all, I have always liked the Dodge's and saved up a couple of years after selling my 97 GMC Z-71 regular cab and purchased this Dodge...I am somewhat regretting my decision...
 

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I have no experience with what you are describing, but you should get a second or third opinion and hopefully someone here will have more info.
 

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I'm just spitballin' here, but it sounds like ur describing a problem with one of the CV joints...mainly because of the wheel turning diagnostic. Get a second opinion, find a mechanic who'll actually test drive ur vehicle. Wouldn't surprise me to find something was missed in the front end suspension work done, drive or steering...or even faulty parts that are "brand new".
 

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I would be looking at the hubs too. If one is going bad, it can cause problems like this.

Sent from my SM-G955U using Tapatalk
 

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I was going to suggest rotating the tires, just to see if the vibration changed. From your post, it shouldn't be a wheel balance problem...but it can't hurt to check.
 
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