Shudder Shudder
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Post Fiend
Joined: Jul 2005
Posts: 14,582
Likes: 12
From: 21791
Shudder Shudder
Ive noticed a new problem in the last two-three weeks, i thought it would go away, but it doesnt. It's defanitely a problem with the engine, and not drivetrain. When i am in OD, or D, right at 1500-1550 rpm with the torque converter locked, i gently ease into the throttle to keep a constant speed on a flat road or slight uphill, and the truck begins to violently shake up and down, not fore and aft. It feels like the truck is bending in the center between the front and rear axles, and wobbling up and down. I give it more load and it goes away, or slow down/speed the engine up and it goes away. It used to only do it in 60t, now it does it in any program.
Post Fiend
Joined: Feb 2006
Posts: 11,892
Likes: 2
From: Middle Tennessee
Does it seem to stumble when the shudder happens? I hate to think what first jumped into my mind so I would just recommend a buzz test and contribution test to eliminate those. I will not say what I am thinking.
Post Fiend
Joined: Feb 2006
Posts: 11,892
Likes: 2
From: Middle Tennessee
Actually I am not. They seemed to perform quite well at your last dyno.
Just thinking along the lines of what you have done with your truck recently and trying to figure out the likely culprit. What has changed since the shudder started?
Just thinking along the lines of what you have done with your truck recently and trying to figure out the likely culprit. What has changed since the shudder started?
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Post Fiend
Joined: Jul 2005
Posts: 14,582
Likes: 12
From: 21791
Actually the shudder started to occur before the pull, however i dont recall noticing the problem before my last dyno run, but that day i also held the truck above 75-80mph for over an hour on end... Nothing out of the ordinary *shrug*
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Post Fiend
Joined: Feb 2006
Posts: 11,892
Likes: 2
From: Middle Tennessee
If you get a chance, do the buzz and contribution tests. I have a theory if you are sure it is the engine and not tranny back stuff getting worse.
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Elder User
Joined: Jun 2005
Posts: 567
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From: Albemarle, NC
bumping this cause it sounds just like my issue. mines been doing it for the last year. it started right after i had the tranny replaced. i figured it to be a balance issue, but not sure whats out of balance or off. i have had tires balanced and rotated, checked front suspension, seems ok. can't figure it out.
it only does it on mine if i am lightly on the throttle and right at 40mph only. if i cruise, it doesn't do it, and if i get on it a little more, it goes away like Kris mentioned.
it only does it on mine if i am lightly on the throttle and right at 40mph only. if i cruise, it doesn't do it, and if i get on it a little more, it goes away like Kris mentioned.
Post Fiend
Joined: Feb 2006
Posts: 11,892
Likes: 2
From: Middle Tennessee
Been busy with another truck Kris? Guess you have not checked yours yet.