Skip the auto shop - Our mechanics make house calls

Q: Shudder or bounce after hitting bump

asked by on

My truck is 2wd with rack and pinion steering, I have a shudder or fast bounce only when I hit a bump at any speed and a slight vibration from 40-50mph. I believe the shudder is coming from the rear. I have installed new quality Moog components in the front: upper control arms, lower control arms, wheel hubs, outer tie rods, sway bar end links, and sway bar bushings. I ve also installed new Bilstein shocks all around. I am a part-time mechanic myself, am stumped by what it could be. I assumed the shocks at first then thought it was the front end. What else could cause this? All part numbers are correct. Please help!

My car has 112000 miles.
My car has an automatic transmission.

Hello there, thank you for writing in. Based off of your details, you may first want to concentrate on diagnosing the speed sensitive vibration at 40-50 MPH because that will be easier to resolve. I would place wireless chassis ears at all 4 corners of the car, probably attaching to the hub/spindle area. Run vehicle at speed necessary to generate the vibration and try to isolate a corner (i.e., switch between the channels and listen at each corner).

If a corner(s) stands out as noisier than the others, see if you have an issue with that wheel/tire assembly. "Imbalance" can easily be hidden (i.e., tire will check out perfectly on balancer but vibrate noticeably) if the issue is a tire defect, abnormal wear or road force related "variation". Resolve that first and see if the symptoms when hitting a bump are reduced or eliminated.

If not, you can use chassis ears as well to diagnose that, although you will have to make many "passes" over a known bump in the road that will create the necessary signal, while switching between the channels on the chassis ears. If you’d like YourMechanic can assist you with this diagnostic by coming to your home or office to inspect the issue.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Blowing engine 1 fuse every time I start the truck

Hi there. If the fuse continued to blow after these were disconnected then there is either a shorted wire or a computer problem somewhere. I usually also disconnect the computer to isolate that from the circuit. At that point if...

Q: Can I have

Hi there. I'm not sure as to which component you are asking for a price quote. Before you decide to have parts replaced, you might want to read this article on the P0016 OBD-II trouble code as it will tell...

Q: Ball Joints / Suspension parts may be damaged.

The best thing to do is put the vehicle on jack stands and remove the tires to the suspension that is to be damaged. Then check the ball joints, control arm bushings, and the control arms and see if there...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...