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Vibrations at 19 mph

vicdanj

By vicdanj
in Troubleshooting & Recalls

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vicdanj Enthusiast

vicdanj

Posted
Posted

ugh... ok here is the deal. I have vibes at 19mph wether accelerating or decelerating or in nuetral. no vibes after 20mph and not too noticeable if any under 15. Truck is a 2014 silverado high country 4x4 crewcab with short box. 2.25 front level, 2.5 inch rear blocks, 33 inch tires 275/60R20 on stock rims. Tires have been balanced twice last was with Ground force or road force balancer. It only happens at that speed on the dot... load no load etc. Could drive train be slightly out due to the lift etc? i am out of thoughts as it is a specific speed only.

 

things to check?

 

vibes are not crazy bad but they are there so i would like to get rid of em.

Dnt Senior Enthusiast

Dnt

Posted
Posted

tires are not perfectly round to start with and if the installer failed to seat them on the rims just right you will have a wobble that you can feel at the slower speeds. If you are experiencing shake at 19 that would be about where a improperly seated tire problem would show up. first thing that i would do would be to have all 4 broken down and reseated/rebalanced (rims must be lubricated to seat the tire properly) and also have them check the roundness "run out" after reseating. You probably had a good tire shop do yours, but for others info you may have to go to a real tire shop to get this done, the younsters down at the corner wally world typically do not have a clue....................

fondupot Senior Enthusiast

fondupot

Posted
Posted

tires are not perfectly round to start with and if the installer failed to seat them on the rims just right you will have a wobble that you can feel at the slower speeds. If you are experiencing shake at 19 that would be about where a improperly seated tire problem would show up. first thing that i would do would be to have all 4 broken down and reseated/rebalanced (rims must be lubricated to seat the tire properly) and also have them check the roundness "run out" after reseating. You probably had a good tire shop do yours, but for others info you may have to go to a real tire shop to get this done, the younsters down at the corner wally world typically do not have a clue....................

 

I agree. Have all four tires and wheels broken down and reseated. Then have them rebalanced and see if you are still having vibes.

 

Good luck.

vicdanj Enthusiast

vicdanj

Posted
  • Author
Posted

that has been done once already and vibe is still there. at 19 on the nose which is weird for a tire issue... it doesnt start and creep up to a vibe its just bam vibe at 19 then gone at 20... wth?

vicdanj Enthusiast

vicdanj

Posted
  • Author
Posted

and to answer other post... yes alignment done. actually had it done then rechecked a day or two later due to vibe issue.

bigblzr94 Enthusiast

bigblzr94

Posted
Posted

maybe it's your driveline angle with the rear blocks installed, and that speed is the only time you can feel it.

KARNUT Senior Enthusiast

KARNUT

Posted
Posted

Did you have the shake before the mods? Did you do all the mods at once? Can you do a change with some one on the wheels? You may have to do a rewind till you make it stop. I been in your shoes its not fun. I try to do only one thing at a time so if something weird happens I know why.

vicdanj Enthusiast

vicdanj

Posted
  • Author
Posted

Did you have the shake before the mods? Did you do all the mods at once? Can you do a change with some one on the wheels? You may have to do a rewind till you make it stop. I been in your shoes its not fun. I try to do only one thing at a time so if something weird happens I know why.

before mods no... did lift first then tires 2 days later.... the 2 days inbetween adding tires there was some vibe there but it got more pronounced after the tires went on... but its not shaking rock n roll still its more of a slight shudder ... my lizard brain is leaning towards the driveshaft alignment being slightly out and i can feel it maybe.... I am thinking maybe i need to check angles on the drive shaft to see if they are out of whack but i am not entirely sure of the measurement process and what they were stock... if anyone knows i sure would appreciate... I hate having to deal with dealerships and or shops that could care less and will have me chasing my tail for weeks. I would rather just check and figure it out my damn self then if something needs to be corrected i already know what it is and tell them exactly what to do.

kstruckcountry Senior Enthusiast

kstruckcountry

Posted
Posted

Don't rule out the tires. At that low of a speed the balance doesn't make much difference unless it's way off.

 

Some tread patterns will cause a vibration at lower speeds though. If the vibrations are a lower frequency that's probably it. For example, the tires I had on my old truck would do it 10-15 mph. Not really fast, more like driving over a bunch of tiny washboards.

vicdanj Enthusiast

vicdanj

Posted
  • Author
Posted

Don't rule out the tires. At that low of a speed the balance doesn't make much difference unless it's way off. Some tread patterns will cause a vibration at lower speeds though. If the vibrations are a lower frequency that's probably it. For example, the tires I had on my old truck would do it 10-15 mph. Not really fast, more like driving over a bunch of tiny washboards.

well... its a popular tire... anyone else getting that?

KARNUT Senior Enthusiast

KARNUT

Posted
Posted

There may be people here waiting to read how you resolved your problem, they could be waiting to do the same mods you did. So as Judge Judy would say ( bump) is not an answer.

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