Need help finding groan/vibration
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Senior User
Joined: Feb 2006
Posts: 348
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From: Central, NY
Need help finding groan/vibration
Ok here is when I hear it:
If you are doing a crusing speed you can hear it, and feel it a bit under your feet.
When you let off the accelerator you can feel it as the TQ converter remains locked and it gets lower pitched until the TQ converter unlocks and the engine idles and truck coasts.
It tends to adjust pitch with the RPM's, and gets slightly louder under load.
It's not all that loud, but I don't think its right. If you are accelerating you can't hear it over the engine, and if you have the stereo up to a medium level you can't hear it, but can still feel it a bit in your feet.
Anyone else have anything similar?
It's an auto, hubs are unlocked, in 2wd, and the front driveshaft spins freely. Not a click or anything. Just a frictional rub...
If you are doing a crusing speed you can hear it, and feel it a bit under your feet.
When you let off the accelerator you can feel it as the TQ converter remains locked and it gets lower pitched until the TQ converter unlocks and the engine idles and truck coasts.
It tends to adjust pitch with the RPM's, and gets slightly louder under load.
It's not all that loud, but I don't think its right. If you are accelerating you can't hear it over the engine, and if you have the stereo up to a medium level you can't hear it, but can still feel it a bit in your feet.
Anyone else have anything similar?
It's an auto, hubs are unlocked, in 2wd, and the front driveshaft spins freely. Not a click or anything. Just a frictional rub...
Thread Starter
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Senior User
Joined: Feb 2006
Posts: 348
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From: Central, NY
Ya, that's whats weird. Maybe I will take my digital camera/movie recorder with me in the truck tomorrow and see if I can capture the sound.
I mean what else could it be that could cause vibration that follows the engine? Or maybe it's just increased by engine load and I think it's rpm based. When the engine is cut for that second or so after letting off the throttle it's dead quiet. Even when it's idling as you're coasting it's quiet. But you really notice it when the TQ is locked, and you're off the throttle just letting the engine drag the truck down a bit.
Or if you're doing 55-60mph and you hit a slight grade and give it a bit more throttle it makes the noise a little louder.
I mean what else could it be that could cause vibration that follows the engine? Or maybe it's just increased by engine load and I think it's rpm based. When the engine is cut for that second or so after letting off the throttle it's dead quiet. Even when it's idling as you're coasting it's quiet. But you really notice it when the TQ is locked, and you're off the throttle just letting the engine drag the truck down a bit.
Or if you're doing 55-60mph and you hit a slight grade and give it a bit more throttle it makes the noise a little louder.
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From: Rio Rico, AZ.
Originally Posted by BowDown
Maybe a U-Joint?
Of the next Riffraff East
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New User
Joined: Apr 2006
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From: Elgin Texas
I have a 99 4X4 7.3 with 56,000 miles. I have a similiar problem, I too feel a vibration on the drivers side floor board and it seems to be the worse around 65 to 70 MPH. It does not seem to change if I put the tranny in neutral while going 65 to 70 MPH. I had the tranny fluid changed a few days ago and it did not change the vibration. I checked the carrier bearing and you can move it maybe 1/4" to 3/8" and does not look to bad. Trying to pinpoint the vibration, if I find anything I will re-post.
