diff noise while coasting??

[BBVX]

Lifted, and big tires, neither of which was my problem.

My rear axle was out of alignment, from going offroad, alot. There are (for all intents and purposes) 3 rods that hold your rear axle in place. 2 go front to back and 1 goes side to side, well I bent them ALL ! This was causing rear driveshaft vibration.

We took them off, straightened them with a jack, and have been good ever since. I noticed a similar noise recently, faint but growing, but I greased all the fittings on the rear driveshaft and it went away.

Brian

[VR4-Quest]

Well wait, you mentioned the dealer getting you a new rear axle, what does that have to do with the bent rods, or did they lead to the failure of the rear axle?
Guess Im trying to figure out if this is a rear axle or rear axle placement issues, and if its amplified by lifting the VX (the rear locating rod angle does change with a lift, and so would the "placement" of the rear axle), not just from possible off-road abuse.
As it sounds like everyone that lifts the VX has this vibration issue, and I would like to have the solution to fixing it.

[BBVX]

If I recall correctly, we thought the rear diff was bad shortly after the front diff was replaced. Sure I was beating on them more than your normal driver but they would still be under warranty. They ordered me a new rear diff and it took several weeks to come in. During this time, the service department got a new manager, so when I took it in for the diff replacement, they looked closer and diagnosed it as bent stabilizer and lateral rods, which weren't covered under warranty.

They wanted almost $1200 for the three bars and I said no thanks. We straightened mine and it's been fine since. Even if it didn't fix the problem, I would have bought a stronger set of pre-bent bars from stinkyfab for about half the price.



http://www.stinkyfab.com/index2.html

In hindsight, the driveshaft issue made more sense because the vibration would have been transferred into the T-case, making me hear the noise much farther forward in the vehicle.

Although lifting the vehicle by adding taller springs does slightly move the axle to one side, I don't think it would be enough to cause a vibration (noise) as bad as mine, if any at all. Maybe it's time for a new thread with a "lift vs. noise" poll?

Brian

[Lashsquat]

I can tell you this, i replaced both my rear u-joints and had the driveshaft slip joint "i think its called lubed ,and the same noise you described is gone.
Hope this helps.

[Mikeys00vx]

My "whine" was from a slow leak in the right front tire. When the pressure got down to around 25 psi...I could hear the whine. It concerned me at first..but now I know when I hear it the tire pressure is low.

Mikey

[VR4-Quest]

Obviously there are several types of driveline noises associated with low tire pressures, defective axles, etc. but there seems to be a common issues with noise after lifting. I know for sure this to be the case as mine made noise on the test drive after installing the OME912's, and was fine before. We need to put our heads togther and figure this one out!

Again, Im talking specifically about a driveline derived noise, after lifting the VX with OME912s or equivalent, happens most notably when letting off the throttle at highway speeds (above 60 mph). Its accompanied by a grinding noise and vibration that can even be felt through the floor (fairly severe). There is also some noticable increase in vibration at lower speeds (around 40 mph).

I have lubed the U-joints and drive shaft, and check the level of all driveline fluids and there was no difference.
I have not yet changed fluids nor had the front bearing repacked lately.
I have maintained the factory rake (front 1" or more lower than rear) and the noise still exists.

Please add your comments, solutions if any, and feedback concerning this so we can determine the root cause!

[IndianaVX]

ive started noticing something similar, tell me what you think.....i am stock, factory rake,just rolled 70,000 i havent packed my bearings, or done my winter checklist yet either.
what im hearing is at lower speeds than mentioned thru this thread. as im driving thru town, or wherever, at 30 mph, when im comming up to a stop sign, for example, shortly after i start to apply my brakes, or even when i just let off the gas, i "hear" a sound like the transmission whinening down. its not grinding, it sounds smooth, not clunky. i also notice this noise when coasting down hill. but when im going UP a hill, and let off the gas, i dont hear this noise. it is very similar type sound as a bad brake pad rubbing on a rotor, kinda.......
i dont hear that well anymore after a surgery i had, but i do hear this, above the constant ringing, and pulse i have in my ear. i dont really have a clue as to wether it has gotten louder, or my hearing has gotten better enough for me to notice this noise, but now that i know its there, its got me in OCD mode, and i am listening to it intenly trying to determine where its coming from, and if it sounds "bad" or normal, which again, is hard to do when you dont hear in stereo, so to speak. but it "feels" like its coming from t.o.d, or tranny.
it sounds like its a pretty common noise. but like i said, im not lifted, and most of the previous post are from lifted vx's. oh, my tires are inflated properly too.
SUGGESTIONS??? check my fluids, and roll with it?
thanks guys for any input
and if your a veteran, it goes double......

david

[ZEUS]

SUGGESTIONS??? check my fluids, and roll with it?

I think that is a great start. Check fluids or change them, grease all fittings, repack bearings first; then diagnose. Who knows, you might find something when you get underneath it...

[Ascinder]

http://www.vehicross.info/forums/showthread.php?t=12009

fixed

[IndianaVX]

fixed my problem for 75 cents, (for the air pump) yeah, i know.....
i had filled my tires up just two days previous to the post, but there was a bit of a cold snap, and apparantly i lost 10 lbs of air in my right front, and that was making the wierd noise i was hearing, or actually the tire was making the TOD make the weird noise.
so yeah, a bit embarassed, but ill live...........

[Viatcheslav]

Obviously there are several types of driveline noises associated with low tire pressures, defective axles, etc. but there seems to be a common issues with noise after lifting. I know for sure this to be the case as mine made noise on the test drive after installing the OME912's, and was fine before. We need to put our heads togther and figure this one out!

Again, Im talking specifically about a driveline derived noise, after lifting the VX with OME912s or equivalent, happens most notably when letting off the throttle at highway speeds (above 60 mph). Its accompanied by a grinding noise and vibration that can even be felt through the floor (fairly severe). There is also some noticable increase in vibration at lower speeds (around 40 mph).

I have lubed the U-joints and drive shaft, and check the level of all driveline fluids and there was no difference.
I have not yet changed fluids nor had the front bearing repacked lately.
I have maintained the factory rake (front 1" or more lower than rear) and the noise still exists.

Please add your comments, solutions if any, and feedback concerning this so we can determine the root cause!

Any body have solutions of this problem? I have the same noise in my JDM VX, it lifted about 4 cm with springs from Trooper.
Please help me the noise is very bad!

[Sprey]

Any body have solutions of this problem? I have the same noise in my JDM VX, it lifted about 4 cm with springs from Trooper.
Please help me the noise is very bad!

Ive got the noise as well after lifting, and i have a jdm vx too.

Viatcheslav Are you driving in Tod all the time or 2wd?

I think with mine say im doing towards 100kmh and i coast i can hear the noise in TOD , but i think when im in 2wd the noise isnt there?.

Tho after greasing up the driveshaft and the u-joints the noise quietens down a fairbit.

Ill have a play 2mrw and see if the noise is louder in Tod or 2wd.

The noise i have sounds like a chaddering noise.

[Polie]

Well, I know with my zuk its the splines on the drive shaft that causes the SAME noise when decelerating. Its caused by the splines having less contact surface vs stock and being slightly worn from years of use.

Not sure if it helps, but there ya go

[Viatcheslav]

Ive got the noise as well after lifting, and i have a jdm vx too.

Viatcheslav Are you driving in Tod all the time or 2wd?

I think with mine say im doing towards 100kmh and i coast i can hear the noise in TOD , but i think when im in 2wd the noise isnt there?.

Tho after greasing up the driveshaft and the u-joints the noise quietens down a fairbit.

Ill have a play 2mrw and see if the noise is louder in Tod or 2wd.

The noise i have sounds like a chaddering noise.

I am driving in TOD and 2 wd, but I heared this noise when TOD and 2 wd but in TOD the nose rather more than in 2 wd.
First of all i think something wrong with u-joints I have replaced it but nothing happened then i replaced rear diff the noise still there.
Now I think the noise happen becouse angle of drive shaft changed as compared with stock.
What lifted your VX in centimeters now?
I have planing to change trooper springs for stock i hope it help.
Sorry fo my English

[Sprey]

Yea im running the ome 912, i think i gained around 60mm or maybe a tad more plus running a bigger tye - 265/75/16 to be exact.

Id say your right about the angle of the driveshaft. done