Its always something

Fabio_The_Jocker · **Joined:** Fri Mar 10, 2017 6:37 am **Posts:** 13

Next weekend change the 'differential oil.
The vibration (is strong) feel only under torque

racertracer · **Posted:** Mon Mar 13, 2017 10:12 am

Note that besides changing the Diff. fluid, you must clean out the crud at the bottom of the housing. If your diff fluid has never been changed then you will see and feel caked mud at the bottom of the housing. It may be a difficult thing to feel but it's there because of tight conditions in there you may not be able to get your fingers between the gears and the housing..... I used 2 cans of brake fluid to wash it out.

It was a noticeable difference.

Fabio_The_Jocker · **Joined:** Fri Mar 10, 2017 6:37 am **Posts:** 13

100.000 km (60.000 + miles) and the first owner has never changed..

But the caked mud where it is formed, on the lower bowl of the differential?
Thanks for the tips, I'll use also a cleaning fluid brake. After using it, i have to wash with another or i can fill immediately with oil?

racertracer · **Posted:** Mon Mar 13, 2017 12:28 pm

Fabio_The_Jocker wrote:

100.000 km (60.000 + miles) and the first owner has never changed..

But the caked mud where it is formed, on the lower bowl of the differential?
Thanks for the tips, I'll use also a cleaning fluid brake. After using it, i have to wash with another or i can fill immediately with oil?

Use brake cleaner., Let it dry and fill with new differential oil. I used synthetic oil.

Let us know if it solved your shaking at high speeds, thanks.

Fabio_The_Jocker · **Joined:** Fri Mar 10, 2017 6:37 am **Posts:** 13

Ok thanks, I'll do that.
My problem is not the high-speed vibration, but when accelerating under torque. Strong vibrations and noise, just leave the accelerator immediately stops.

WolverineFW · **Posted:** Mon Mar 13, 2017 2:50 pm

Fabio_The_Jocker wrote:

WolverineFW wrote:

Is you drive shaft out of balance or bent?

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how can I check if the drive shaft is balanced or not? :?:

my vibrations coming from behind (rear axle, driveshaft, differential)?

You would have to take it to a shop that specializes in drives hats.

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WolverineFW · **Posted:** Mon Mar 13, 2017 9:57 pm

That should be drive shafts.

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Fabio_The_Jocker · **Joined:** Fri Mar 10, 2017 6:37 am **Posts:** 13

You think that my problem is the driveshaft?

GordnadoCRD · **Posted:** Tue Mar 14, 2017 4:21 am

More like one branch of possibilities that can be either ignored or addressed, depending on what is found at the drives hats show when you get it there.

Fabio_The_Jocker · **Joined:** Fri Mar 10, 2017 6:37 am **Posts:** 13

First, will change the differential oil, let's see if there is an improvement, then we update.
For now, thanks.

mass-hole · **Posted:** Tue Mar 14, 2017 3:55 pm

For anyone interested, it was the U-joint. I couldnt feel it by hand until I went under and checked again this weekend, got it swapped out monday and all is good now.

This is the 2nd one in ~30,000 miles. The first one I replaced a year and a half ago before the lift at ~60k.

Fabio_The_Jocker · **Joined:** Fri Mar 10, 2017 6:37 am **Posts:** 13

Very good! But let me get this straight:
Transmission in lockup, slightly uphill and motor under torque from half throttle on full, right? Does a strong vibration accompanied by a noise like a "tutututu" up to about 2000 RPM then stops? If you leave the gas, noise and vibration stops?
Vibration and noise coming from the back, rear axle?
Mine has these exactly symptoms, are like yours?
If so, might be my u-joint. First time I immediately thought of the TC

thermorex · **Posted:** Tue Mar 14, 2017 9:08 pm

Fabio_The_Jocker wrote:

Very good! But let me get this straight:
Transmission in lockup, slightly uphill and motor under torque from half throttle on full, right? Does a strong vibration accompanied by a noise like a "tutututu" up to about 2000 RPM then stops? If you leave the gas, noise and vibration stops?
Vibration and noise coming from the back, rear axle?
Mine has these exactly symptoms, are like yours?
If so, might be my u-joint. First time I immediately thought of the TC

If you feel like you're driving on rumbles, like on the highway sides of the lane, then it's the torque converter. And this should be only when you're entering the lockup, at 50 mph.

Fabio_The_Jocker · **Joined:** Fri Mar 10, 2017 6:37 am **Posts:** 13

I can feel it in lockup because I transmit all torque. But if they are uphill, noise / shots are not fast like on the side strips.
To understand: it is not a "trrrrrrr" but "ta-ta-ta-ta".
Sorry, but it's hard to explain.

Tested also a ECU map with less torque for test the TC but the intensity of vibration/noise is the same, does not change.

mass-hole · **Posted:** Wed Mar 15, 2017 12:43 pm

Fabio_The_Jocker wrote:

Very good! But let me get this straight:
Transmission in lockup, slightly uphill and motor under torque from half throttle on full, right? Does a strong vibration accompanied by a noise like a "tutututu" up to about 2000 RPM then stops? If you leave the gas, noise and vibration stops?
Vibration and noise coming from the back, rear axle?
Mine has these exactly symptoms, are like yours?
If so, might be my u-joint. First time I immediately thought of the TC

Mine was not exclusively doing it in lock-up. Typically it was around 50 mph when the vibration was the worst and then it would fade away as you went faster. Same thing happened when the first u-joint failed.

My U-joint was noticeably loose at the end, like i could wiggle it by hand. Both times they failed I would check and it would feel fine, then I checked again a month or two later and they were about to fall apart.

Fabio_The_Jocker · **Joined:** Fri Mar 10, 2017 6:37 am **Posts:** 13

thanks, i will update you on the developments

Fabio_The_Jocker · **Joined:** Fri Mar 10, 2017 6:37 am **Posts:** 13

Hello everyone, I update you ..
I replaced the T-Case and differential oil and the defect is decreased a lot

.
I believe is the differential pinion bearing ruined, with new oil that goes better. Could be?

Its always something

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