vibration high speed
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vibration high speed
i get a viberation at 75 to 85 and up stops after speed drops below 75
ihad tires balanced oh yea just bought the truck 2000 7.3 crew cab
66,000 miles what i found freaked me out thier was no oil in the transfer case
maybe two onces and yea thier was metal savings this might be a dumb question but would this be the cause of vibrtion at high speed.
looked like sombody had replaced drive shaft and hanger bearing the bolts were clean and shaft had no rust on it ????
thanks for any replies
former chevy owner
ihad tires balanced oh yea just bought the truck 2000 7.3 crew cab
66,000 miles what i found freaked me out thier was no oil in the transfer case
maybe two onces and yea thier was metal savings this might be a dumb question but would this be the cause of vibrtion at high speed.
looked like sombody had replaced drive shaft and hanger bearing the bolts were clean and shaft had no rust on it ????
thanks for any replies
former chevy owner
Elder User
Joined: Mar 2003
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From: AZ.
I've always been under the impression that the U-joints had to be aligned. If someone did work on the drive shaft, maybe they got the two shafts off a spline or two. I've always had trouble eyeballing them to get them right. Maybe my eyes are just on crooked..JMHO.
Fleet Mechanic
Joined: Feb 2004
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From: River Valley AR
tjg-
I agree that the drive shaft must be timed. I think that if it was not in time it would probably vibrate worse with more speed but maybe not.
Maybe your driveshaft and hanger bearing sufferd some kind of failure that may have bent the driveshaft. Are the hanger bearing bolts tight? Is there any slack in the u-joints?
I have had a tire that was cupped cause the vibration that you are talking about. even though it may be balanced it may not be round. look to see if one part of your tire has less tread than the rest. it could be a flat spot where the tire locked up. if you can feel it in the steering wheel it may be on the front end.
If you can eliminate these things then it may very well be damage to your transfer case.
I hope it's just a loose bolt but i would keep an ear out for a used transfer case just in case. good luck with it
I agree that the drive shaft must be timed. I think that if it was not in time it would probably vibrate worse with more speed but maybe not.
Maybe your driveshaft and hanger bearing sufferd some kind of failure that may have bent the driveshaft. Are the hanger bearing bolts tight? Is there any slack in the u-joints?
I have had a tire that was cupped cause the vibration that you are talking about. even though it may be balanced it may not be round. look to see if one part of your tire has less tread than the rest. it could be a flat spot where the tire locked up. if you can feel it in the steering wheel it may be on the front end.
If you can eliminate these things then it may very well be damage to your transfer case.
I hope it's just a loose bolt but i would keep an ear out for a used transfer case just in case. good luck with it
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tires are bran new i feel nothing until i hit 75 i dont feel the vibertion on the steering wheel or the beake pedels u jionts are tight and drive shaft ok i had it in a shop and they lifted the truck with one guy in it and they brought it up to 75 they said they could realy feel the viberation on the frame of truck near transfer case iam bringing it back to the dealer on monday being that thier was no oil in tranfer case they said they would look at it and i have a feeling thats all thier going to do 
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well i got the drive shaft ujoints and hanger bearings balanced and made a lot of differance but know i got a hormonic viberation from rear end thats were it sounds like it coming from
everthing is smooth until 82 mph then a hormonic sound or viberation
at 87 it levels out ( doesnt get any louder )
now when i let off on throttle it goes away everthing is pretty smooth as soon as i give it gas the hormnic is back if i hold throttle it is not as loud as if i were giving wot
i did jack the rear end up brought truck up to 82 mph the homonics were thier
but not as loud could hardly hear it but could feel viberation so i removed back tires brought it back up to 82 mph with rear jacked up no change!
so would i need to lower or shimmy carrier bearing?
buy the way when i had drive shaft in for balacing i took my truck up to 85mph in front wheel drive no vibertion no hormonics thats why iam woundering if i need to shimmy carrier bearing
any thought would be great from anyone
i been learning a lot about the psd from this forum and whish to thank
everyone for all the great info
everthing is smooth until 82 mph then a hormonic sound or viberation
at 87 it levels out ( doesnt get any louder )
now when i let off on throttle it goes away everthing is pretty smooth as soon as i give it gas the hormnic is back if i hold throttle it is not as loud as if i were giving wot
i did jack the rear end up brought truck up to 82 mph the homonics were thier
but not as loud could hardly hear it but could feel viberation so i removed back tires brought it back up to 82 mph with rear jacked up no change!
so would i need to lower or shimmy carrier bearing?
buy the way when i had drive shaft in for balacing i took my truck up to 85mph in front wheel drive no vibertion no hormonics thats why iam woundering if i need to shimmy carrier bearing
any thought would be great from anyone
i been learning a lot about the psd from this forum and whish to thank
everyone for all the great info
Fleet Mechanic
Joined: Feb 2004
Posts: 1,816
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From: River Valley AR
I would guess from your tests that your problem might very well be in the rear axle. Maybe ring and pinion related. Carrier bearing shim might be worth lookin at. Maybe an axle that's not straight? Glad to hear the balancing helped the noise, but I have to wonder-- was being out of balance the cause or the symptom? If it was the symptom, then whatever is still vibrating may have been the cause.
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thanks for reply i will try to shimmy carrier bearing thier is no lift in truck look like
thiers been some work done to rear end before i brought truck noticed a new stabalizer bar one side had new lift block
also is the pinion on rear end supoosed to be level with ground or should it be pitched upward a little toward carrier bearing
i will do a search on the pitch of pinion
ma
thiers been some work done to rear end before i brought truck noticed a new stabalizer bar one side had new lift block
also is the pinion on rear end supoosed to be level with ground or should it be pitched upward a little toward carrier bearing
i will do a search on the pitch of pinion
ma
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viberation
can sobody tell me if this is correct working angles for drive train if so my drive train on my 2000 7.3 cc is not even close to this pic my front shaft isnt in line with transmission plus it is out of phase i would have to drop carrier bearing an inch or shimmy transfercase
what do you all think let me know
what do you all think let me know
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well found source of viberation had to shimmy up trasmission a 1/4 " that brought my working angle of t c to 1degree it was 2degrees they recommend 1/2 to 0 degree
also had to shimmy carrier bearing down 1/2" my front and rear working angles are still off about 4 degrees of each other i need to add shimmes to rear axle so both working angles are the same.
for now it is fine no viberation or hormonics even at 90 mph
also had to shimmy carrier bearing down 1/2" my front and rear working angles are still off about 4 degrees of each other i need to add shimmes to rear axle so both working angles are the same.
for now it is fine no viberation or hormonics even at 90 mph
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