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View Full Version : help with a lot of vibration after 50mph


tipito147
10-22-2009, 08:11 PM
HI:
I have a LX450 and it started to vibrate a lot, i opened the front differential and i took it to my mechanic friend and he didnt find anything, i replaced the front bearings and its still vibrating.
When i relase the gas pedal the noise and vibration leave. i guessed it was the differential but i was wrong.
Any guesses? It starts by vibrating in the passenger seat
I would apprecitate any help!!!!

RicardoJM
10-22-2009, 08:26 PM
The drive shaft bolts on the Bronco work loose and it resulted in vibration at speed. Upon tightening the bolts all was smooth again. The problem seems to not have re-occurred since he used red-locktite on the bolts.

powderpig
10-22-2009, 09:31 PM
Do you feel the vibration more in the steering wheel or the seat?
U-joint will create vibration. Maybe tell us more about your truck. always better to give more info then less.

Uncle Ben
10-22-2009, 09:34 PM
does the vibrations occur when light acceleration but gone on coast? How many miles on the truck and how does the tranny fluid smell?

wesintl
10-22-2009, 09:57 PM
you must be a hit with the ladies :hill:

nuclearlemon
10-22-2009, 10:02 PM
have you lost any wheel weights? are your driveshafts in good condition?

TIMZTOY
10-23-2009, 12:12 AM
Most likely is the u joints.
Could also Be, but doubt it, is the pinion bearing.
Highly doubt it's the axle or wheel weights. Wheel weights would do it at speed regardless of throttle. If it's vibrating in the steering wheel= wheel weights or axle.
Whole car vibrating = u joints or pinion bearing
highlly unlikely & far shot - engine bearings, main's, rod, exc.

Rezarf
10-23-2009, 10:55 AM
Check the phase of the driveshafts as well. If they are not exactly perpindicular to one another you will get vibrations as well.

Drew

Bikeman
10-23-2009, 12:07 PM
FYI, 80-series front diveshafts are out-of-phase from the factory.

Rezarf
10-23-2009, 01:31 PM
FYI, 80-series front diveshafts are out-of-phase from the factory.

Well, that explains the problem! :D

Didn't know that, I humbly bow out of the 80 tech section now... :bowdown:

AxleIke
10-23-2009, 07:10 PM
FYI, 80-series front diveshafts are out-of-phase from the factory.

Uhhh...Better not be. Guaranteed vibration if they aren't.

I'm assuming the 80 fronts have a double cardan front, so the transfercase joint is at an angle and the pinion joint is straight. Thats "in phase" for double cardans.

tipito147
10-23-2009, 07:42 PM
Thanks every one for your quick responses, today i start from 0 to search where the problem is coming from, the problem is definitive between the differential and u-joint. I checked the u-joint by moving then up and down and they didnt have enough play, thats why removed the differential and i change bearing, today i check the u-joint with both of the front wheels on jack stands, and the problem appeared " The F.. U-joint" after 30 minutes and $8,99 the problem was solve. I feel dumb.

Uncle Ben
10-23-2009, 08:20 PM
Uhhh...Better not be. Guaranteed vibration if they aren't.

I'm assuming the 80 fronts have a double cardan front, so the transfercase joint is at an angle and the pinion joint is straight. Thats "in phase" for double cardans.

Isaac, Bikeman speak truth! 80 fronts are 90* out of phase! Probably because the mis match of Cruiser parts to the mini truck junk in the front axle! :lmao::lmao:

Mendocino
10-23-2009, 08:47 PM
Tie rod ends and alignment?

AxleIke
10-23-2009, 11:26 PM
Isaac, Bikeman speak truth! 80 fronts are 90* out of phase! Probably because the mis match of Cruiser parts to the mini truck junk in the front axle! :lmao::lmao:

:confused::confused::confused:

I can't see how that would work at all.

Do enlighten me.

AxleIke
10-23-2009, 11:27 PM
Tie rod ends and alignment?

He found the problem.

Didn't check the u-joint with the wheels in the air.

TIMZTOY
10-23-2009, 11:53 PM
Tie rod ends and alignment?

Both of those would cause Either a slop in the steering or a pull. Even a clunk if extreamlly worn (in some cases);)

Uncle Ben
10-23-2009, 11:53 PM
:confused::confused::confused:

I can't see how that would work at all.

Do enlighten me.

The crosses are still, obviously, in phase but the yokes are 90* different from each other.

Here is a pic I pirated from Mud...

http://forum.ih8mud.com/attachment.php?attachmentid=58855&stc=1&d=1140668083

60wag
10-24-2009, 08:18 AM
The 80 front shaft is set up in a "broken back" or "W" configuration. From what I can gather, the odd setup is used when the input and output flanges aren't parallel. I had a web page that went into more detail but can't find it at the moment. There is a brief mention of it here:

http://www.pirate4x4.com/tech/billavista/PR-shaft/index2.html

Jacket
10-24-2009, 09:01 AM
The 80 front shaft is set up in a "broken back" or "W" configuration.

"Brokeback 80" :lmao::lmao::lmao:

Uncle Ben
10-24-2009, 09:04 AM
"Brokeback 80" :lmao::lmao::lmao:

:brick:

AxleIke
10-24-2009, 11:07 AM
Ah. That makes more sense. I had something different in mind.

Thanks!