High Frequency Vibration
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Senior User
Joined: Aug 2001
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From: Kentucky
High Frequency Vibration
Hi all !!
I have my new '05 PSD 250SC, 4X4. Love the vehicle. Got a question. Since this is my 1st 4x4, I need a little insight. I have a high frequency vibration at 45 - 58 mph. I've tried all the usual tests, neutral gear coasting, touching brakes slightly, etc. and it feels like it may be the driveshaft. Do the 4x4s have a characteristic of doing this or should this be taken as seriously as I feel ?? Other than this, it has no other things for me to question at this time. Any way thoughts appreciated.
Thanks,
Bill in KY
I have my new '05 PSD 250SC, 4X4. Love the vehicle. Got a question. Since this is my 1st 4x4, I need a little insight. I have a high frequency vibration at 45 - 58 mph. I've tried all the usual tests, neutral gear coasting, touching brakes slightly, etc. and it feels like it may be the driveshaft. Do the 4x4s have a characteristic of doing this or should this be taken as seriously as I feel ?? Other than this, it has no other things for me to question at this time. Any way thoughts appreciated.
Thanks,
Bill in KY
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From: Central Texas
Can you describe the vibration a little better? I consider a high frequency vibration something that would be associtated with the turbo turbines. Drivelines don't spin that fast.
Do you have any mods? Lift kit? Tires?
Do you have any mods? Lift kit? Tires?
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From: Kentucky
The engine rpm seems to have nothing to do with this vibration. I waited for the turbo to slow down at idle, while in neutral (TorkShift) and the vibration was still there. It goes away completely below 48 mph and above 58 mph. It seems its worst at 55. I'm going to drive it tomorrow with the 4x4 engaged and see if anything changes. The truck only has 650 miles on it so we'll see.
Thanks for the comeback
Bill in KY
Thanks for the comeback
Bill in KY
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From: Central Texas
Are your hubs disengaged? Jack up one of the front wheels. Rotate it. The U-joint inside shouldn't move. If so, turn the hubs to lock and then to auto. That should disengage them.
Other vibration could be drive shaft angle at the center driveshaft joint. Take it in to the dealer.
Other vibration could be drive shaft angle at the center driveshaft joint. Take it in to the dealer.
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From: Hendersonville, NC
Originally Posted by SBV45
Are your hubs disengaged? Jack up one of the front wheels. Rotate it. The U-joint inside shouldn't move. If so, turn the hubs to lock and then to auto. That should disengage them.
Other vibration could be drive shaft angle at the center driveshaft joint. Take it in to the dealer.
Other vibration could be drive shaft angle at the center driveshaft joint. Take it in to the dealer.
My bet is with you on the hubs, mine have an annoying vibration on occasion...
BTW, you've got mail.
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I say its the bearing carrier or you have the general tires on it. General tires are very problematic. I was just at the dyno last weekend. I saw general tires on a truck. I told my buddy lets get away from these rear wheels. you should have seen everybody cringe and turn around when those tires started distorting. so If you are running general or continental tires they may be the culprit.
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From: 3rd Rock
Originally Posted by PSD 60L Fx4
Since he has a Supercab truck (assuming it is a SWB) it doesn't have a carrier bearing, so the shaft angle shouldn't be an issue unless the truck is lifted (I can't remember if the LWB SC's have a carrier bearing or not).
My bet is with you on the hubs, mine have an annoying vibration on occasion...
BTW, you've got mail.
My bet is with you on the hubs, mine have an annoying vibration on occasion...
BTW, you've got mail.
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From: Melbourne, Aus
With other vehicles I have worked on high frequency vibration has been caused by an out of balance driveshaft, but these are all on vehicles with IRS - far more sensitive to driveline vibe than live rear axles - it still could be the cause of it though.
Also you might want to check your driveshaft alignment, that can cause a vibration, but its usually a relativly low frequency one.
I have seen turbo's out of balance on other vehicles, but it is dependant on engine rpm and load
After all this, honestly I don't know what could be causing it... It could also be a wheel out of balance - does it appear to come from onw corner of the vehicle???
Also you might want to check your driveshaft alignment, that can cause a vibration, but its usually a relativly low frequency one.
I have seen turbo's out of balance on other vehicles, but it is dependant on engine rpm and load
After all this, honestly I don't know what could be causing it... It could also be a wheel out of balance - does it appear to come from onw corner of the vehicle???
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From: Kentucky
I can feel this vibration more in the seat, as though it is coming from the chassis. Yes it is a long wheel base, I don't believe in SWBs, so it may be the carrier bearing angle. I sure appreciate all your thoughts. This is the greatest exchange of info going.
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From: 3rd Rock
Originally Posted by gibby91477
Hodgekuter,
My truck had the same vibration that you are explaining. It came on about 45-55 MPH. Had the drive shaft indexed and it is extremly smooth now.
My truck had the same vibration that you are explaining. It came on about 45-55 MPH. Had the drive shaft indexed and it is extremly smooth now.