Slight vibration under acceleration
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Smokin
Joined: Jun 2006
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Slight vibration under acceleration
So after I got my DP this spring, I've been noticing what seems to be some slight front end vibration when under heavy acceleration.
If I am on a highway onramp, and I really kick the throttle, I get some very fast somewhat muted vibrations, I can feel in the steering wheel. Once I shift into 4th gear and the RPM goes down and it smooths out, the vibration goes away.
I have some suspension parts that are getting a little worn out, shocks for one, but I was also taking a look at some worn out swaybar bushings and the like.
Ideas?
Also got new tires/wheels at almost the exact same time I got the DP...so that could be a contributor I dont know.
If I am on a highway onramp, and I really kick the throttle, I get some very fast somewhat muted vibrations, I can feel in the steering wheel. Once I shift into 4th gear and the RPM goes down and it smooths out, the vibration goes away.
I have some suspension parts that are getting a little worn out, shocks for one, but I was also taking a look at some worn out swaybar bushings and the like.
Ideas?
Also got new tires/wheels at almost the exact same time I got the DP...so that could be a contributor I dont know.
Posting Guru
Joined: Oct 2007
Posts: 2,225
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From: Farmington, Minnesota
Lisa, what happens in stock or other tunes?
Tires could be unbalanced.
Sway bar shouldn't be a factor, you will feel/hear that under your feet while turning or hitting bumps while driving slow.
I have had warped brake rotors give me vibrations at certain speeds.
Maybe, bring it in and have the tires checked. See if that fixes it.
Tires could be unbalanced.
Sway bar shouldn't be a factor, you will feel/hear that under your feet while turning or hitting bumps while driving slow.
I have had warped brake rotors give me vibrations at certain speeds.
Maybe, bring it in and have the tires checked. See if that fixes it.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
Sorry I missed this, Lisa.
It sounds like your driveline is a bit out of angle and it's shaking the truck when it is under a very high load, such as acceloration.
You need to disconnect it, and flex the u-joints to make sure that none of them are seizing up, make sure that the spline shaft is lubed and that the carrier bearing is not failing.
When all that checks out, it's time to play with the shims for the carrier bearing.
If none of that has any effect, then it's "possible" ( a big maybe ) that your tranny is slipping, and producing that shuddering vibration.
It sounds like your driveline is a bit out of angle and it's shaking the truck when it is under a very high load, such as acceloration.
You need to disconnect it, and flex the u-joints to make sure that none of them are seizing up, make sure that the spline shaft is lubed and that the carrier bearing is not failing.
When all that checks out, it's time to play with the shims for the carrier bearing.
If none of that has any effect, then it's "possible" ( a big maybe ) that your tranny is slipping, and producing that shuddering vibration.
Thread Starter
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Smokin
Joined: Jun 2006
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Lisa, what happens in stock or other tunes?
Tires could be unbalanced.
Sway bar shouldn't be a factor, you will feel/hear that under your feet while turning or hitting bumps while driving slow.
I have had warped brake rotors give me vibrations at certain speeds.
Maybe, bring it in and have the tires checked. See if that fixes it.
Tires could be unbalanced.
Sway bar shouldn't be a factor, you will feel/hear that under your feet while turning or hitting bumps while driving slow.
I have had warped brake rotors give me vibrations at certain speeds.
Maybe, bring it in and have the tires checked. See if that fixes it.
Sorry I missed this, Lisa.
It sounds like your driveline is a bit out of angle and it's shaking the truck when it is under a very high load, such as acceloration.
You need to disconnect it, and flex the u-joints to make sure that none of them are seizing up, make sure that the spline shaft is lubed and that the carrier bearing is not failing.
When all that checks out, it's time to play with the shims for the carrier bearing.
If none of that has any effect, then it's "possible" ( a big maybe ) that your tranny is slipping, and producing that shuddering vibration.
It sounds like your driveline is a bit out of angle and it's shaking the truck when it is under a very high load, such as acceloration.
You need to disconnect it, and flex the u-joints to make sure that none of them are seizing up, make sure that the spline shaft is lubed and that the carrier bearing is not failing.
When all that checks out, it's time to play with the shims for the carrier bearing.
If none of that has any effect, then it's "possible" ( a big maybe ) that your tranny is slipping, and producing that shuddering vibration.
If I do have a u joint that is seizing, or a carrier bearing going bad, would this problem be progressive?
I have several things I need to do to the truck so it sounds like I need to take it out of commission for a week or so and check this out. U joints could be a very real possibility, they've never been replaced.
Has been a rough week though.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
A slipping tranny will produce a rapid thudding sensation.
A driveline out of angle ( I suspect this more since you have a lift kit installed) will make a wobbling sensation that follows vehicle speed, regardless of what gear you are in.
EDIT: The slipping tranny can also be pinned down if it only happens in one certain gear.
A driveline out of angle ( I suspect this more since you have a lift kit installed) will make a wobbling sensation that follows vehicle speed, regardless of what gear you are in.
EDIT: The slipping tranny can also be pinned down if it only happens in one certain gear.
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Fleet Owner
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From: Rio Rico, AZ.
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Smokin
Joined: Jun 2006
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A slipping tranny will produce a rapid thudding sensation.
A driveline out of angle ( I suspect this more since you have a lift kit installed) will make a wobbling sensation that follows vehicle speed, regardless of what gear you are in.
EDIT: The slipping tranny can also be pinned down if it only happens in one certain gear.
A driveline out of angle ( I suspect this more since you have a lift kit installed) will make a wobbling sensation that follows vehicle speed, regardless of what gear you are in.
EDIT: The slipping tranny can also be pinned down if it only happens in one certain gear.
Also when I am cruising on the highway or whatever, its smooth as silk, at any speed.
Does not seem related to speed or a particular gear.
Have a good day. No hurries or worries, just something I've been noticing and want to identify in case their is a potentially big problem *tranny*. I sure as hell hope not. Its a machine, it can be fixed, and unlike a lot of these guys on this site I don't use my truck for my daily bread and butter.
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Smokin
Joined: Jun 2006
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Another interesting piece of evidence: we just went out to the store, with a short jaunt on the highway. Only does it when I am on a highway onramp, at a downward pitch. On flat surface, fast acceleration from a start, no vibration. 
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
.
Also give a careful listen to the sound of the engine. It might be giving signs of an engine miss under certain conditions, which would produce a noticable vibration.
Have you pulled the valve covers and made sure that the wiring harnesses are fully seated in the not so distant past?
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Smokin
Joined: Jun 2006
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Well, I doubt it's the tranny then. Pulling up hill would exaggerate a slipping tranny or you would have the sense that the engine is revving higher than it used to.
.
Also give a careful listen to the sound of the engine. It might be giving signs of an engine miss under certain conditions, which would produce a noticable vibration.
Have you pulled the valve covers and made sure that the wiring harnesses are fully seated in the not so distant past?
.
Also give a careful listen to the sound of the engine. It might be giving signs of an engine miss under certain conditions, which would produce a noticable vibration.
Have you pulled the valve covers and made sure that the wiring harnesses are fully seated in the not so distant past?
Valve covers were off last winter when the glowplugs were replaced. I paid Kevin to do those (to pay him back for all of his free diagnostic help on my ICP nightmare) but I was under the hood with them the entire time. Everything looked fine, I would've noticed chaffed wires...and this problem didn't present itself until the DP and new tires this spring.
It's hard for me to duplicate the vibration..but I'll do some driving and see if I can pay attention to how the motor is running.
Postmaster
Joined: Dec 2008
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I know this is going to sound crazy but I get vibration at idle with my black c99 international CPS. I have also been getting it at highway speeds but seems to depend on the road angle? I did not even think about it until Dan said something. I'm not sure if it might be related to my programmer. Wish I had AE to run some contribution tests.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
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Smokin
Joined: Jun 2006
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Only places I can get the truck to repeat the behavior is pretty far across town. Truck starts, idles, and drives beautifully..
Thanks for the help Dan and guys. I got some major things going on next week, and we're going out of town..but I'm hoping I get a minute to crawl underneath and take a peak at driveshaft, u joints, etc.
Thanks for the help Dan and guys. I got some major things going on next week, and we're going out of town..but I'm hoping I get a minute to crawl underneath and take a peak at driveshaft, u joints, etc.