Vibration at speed. HELP!

[Babyjohn460]

Hello all! So I'm kind of stumped and apparently, so is the dealership. I have had a bad vibration that seems to be getting worse and in a further and further mph range. It feels like a bad u-joint or driveline vibration, but all is tight. Crossmember bushing was wiped out, cv shaft boots were leaking, tires balanced and alignment done. Didn't make any difference after repairs. It feels rotational and feels too fast for a wheel/tire issue. In the cab, it sounds and feels like you're going over rumble strips. But it ONLY does it feathering the throttle between 40-50(ish) mph. Get into the throttle or completely back off and the vibration goes away. I don't know a lot about transmissions but could there be something worn out at the torque converter or something that could be causing this issue? Has anyone run into this? The vibration/noise has come on gradually so it seems that something is wearing out or getting loose. FYI: torsion bars cranked to spec, 2" rear shackle w/ rear helper springs, lifted shocks, and 1" front wheels spacers. Been to two different dealerships, plus myself searching extensively. HELP!!!


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[cgalpha08]

Wheel spacers would be my guess.

 

[4speedfunk]

Check the CV joint at the rear end of the front driveshaft.

 

[jakesz28]

That sounds like what I started with. Does the speedometer jump around a little when the vibration is at its worse? I would park in a flat lot with the parking brake on in neutral and grab the slip yoke on the rear of the transfer case. Does it have a bunch of play?

 

[woodwardsh3]

torque converter bolts loose or missing or a cracked flywheel ? Not the most likely but it is easily checked by removing the inspection cove and looking.
Or a tire that the belts have separated.

 

[alrock]

Check the CV joint at the rear end of the front driveshaft.

:yeahthat

 

[amrg]

Torque converter? Did you check trans oil level?

 

[Babyjohn460]

Well, after months and months of vibration, finally zeroed in the culprit right before my radiator/tranny cooler cracked (and everyone knows the end result). Something started coming loose at the input shaft or torque converter to cause vibration. Transmission cooler started taking out transmission (slamming from first to second gear mostly) and trans kept popping code for trans input speed signal . Did all upper and lower ball joints and another alignment while we were at it. Alpha drives like a dream now!


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[650Hawk]

Something started coming loose at the input shaft or torque converter to cause vibration. Transmission cooler started taking out transmission (slamming from first to second gear mostly) and trans kept popping code for trans input speed signal .
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So what came loose, and what all was repaired?

 

[Babyjohn460]

So what came loose, and what all was repaired?

Something in the trans, input bearing I'm assuming. Entire trans was swapped out due to the coolant/oil mixture and the clutches slipping. New radiator and cooler and a good flush of the lines.


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[Babyjohn460]

Actually, shop said it was likely the torque converter, basically slipping briefly before getting into throttle or completely letting off. Still under the service contract I bought when I bought the 3. $152.72 out of pocket. Final bill came to mid-$6000 for just this visit! [emoji15]


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[JPaul]

did that fix the noise?

 

[Babyjohn460]

Oh yeah! Drives like brand new right now!


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