OFFICIAL 2nd gen 4x4 front differential bearing vibration thread

Hell yeah man that's why we are here right? To help each other out. I don't mind helping a buddy out

 

Had mine replaced with Toyota's revised bearing at 30k miles and no issues after driving on it for about 5k miles. Fingers crossed...

 

Here ya go bubba. 5/16" exactly so exactly half of the total thickness

 

Thanks a ton man, I really appreciate it.

 

No problem bud

 

Doing my bearing tomorrow. Hopefully it negates all the vibration I get at 50km/h

 

I did message Chase and he said groove position makes no difference, put it where you want.

Messaged Chase and he said that the "deformity" in the bushing is not an issue and to run it.
You ran 40,000 on the oem needle bearing??
I had the bushing put it but for some reason mine is still making a little noise, goes away in 4x4, not near as bad as with the needle bearing but there is some noise and vibe. Maybe I am over sensitive to it now. If I turned my radio on probably would hardly notice it. Maybe put in a sub and won't feel it either. Hate to remove my puny lift because of it but if you went that long on oem bearing and no failures then you would think I would be ok on the bushing, lol...hmmm.
I made damn sure the tech knew how to install it, even gave him the ECGS directions, and video on install so I don't think he did anything wrong.
I brought home my dial indicator so I can take a reading on it to see how much movement there is still. By what I see it looks like at least twice what Chase showed in his video after bushing replace. Is it possible since my bushing had a defect that maybe it also does not have the tighter tolerance of bushings that others have been installing?? Don't know until I take a measurement I guess. Will report back when I get that done.

 

Got out in the garage to check movement of the cv shaft since bushing install. Uploaded a video to youtube. Not sure why youtube made the video skinny like that as on my comp it is wide, oh well. Appears I have approx. .025" movement. I got it as close to the inside edge of the shaft because as most will know the further out you go the more movement there would appear to be. Also attached 2 pics of movement. I did not have the indicator zeroed because of the area I was in I could not see the zero and could not set it up any other way.

 

It's possible that the bushing is defective. What was the condition of your axel? Excessive wear on the axel might cause the same problem.

 

I did not see the axle, had Toyota dealer do it under warranty. I did not even have 20 miles on it after the lift and noise started so would believe shaft is ok. I have a message in to Chase to see what his thoughts are on it too.

I hate to say it but now that I have the bushing installed and the problem is still there just not as bad, the problem is not the needle bearings so much as the spider gear end of it.
When Bushing is installed it gets that spider gear true with the world. I have thought about this many times. The bearing has all those small needles. The spider gear has large teeth and fewer teeth than needles in the bearing. Now with that in mind listen to the noise that it makes.

I mean mine starts at around 5-10 mph and still does it up to 60 + and the noise doesn't really speed up a lot and continues to have a deeper sound than a small needle bearing would, true? And since I have a bushing installed now that is "smooth" it should in no way make that noise anyway, true? So what does that leave?? The spider gear. As I have said, since bushing install I can still put in 4x4 and noise goes away and put it 2 wd and noise comes back so it definitely cannot be the bushing.

Anyway, just put my thoughts here for you guys, let me know if you think I am just a looney toon or whatever and what you think is going on.

 

howd u convince the dealer to use the bushing inplace of the bearing?

 

.025 is very reasonable for movement. And just based on site the movement looks acceptable. Crawl under any IFS diff they have slop, it is inherent to the design and necessary. The reason why the toy IFS diffs make noise is a compound issue of using a needle bearing where it does not belong , supporting the side gear by the pinion gears only, and to steep of CV angle. The bushing supports the shaft better and for a longer distance so it corrects the issue but is not infallible.

More on measuring deflection: Where you measure on the shaft effects that measurement infinitely. The further from the bushing the more the deflection so an accurate spec on that would always have to be taken at the exact same location on the shaft. When we were measuring during design phase 4+ years ago we were measuring right next to the bushing with carrier out of the case which would be the minimum amount possible.

Defect in Bushing: Picture shows what I believe to be something sharp drag down the final coating of the inside of the bushing. Having that scratch there would have no effect on the effectiveness of the bushing and is no different than having an oil journal. The scratch did not even get through the top layer which is only .003 thick. Where a cylinder on cylinder slip fit occurs with one small surface missing .003 will not open up any tolerances.

I hate that it did solve your issue and it is of course possible that the bushing was out of spec but I don't believe it was, based on the measured deflection. From a quality standpoint every batch is checked for tolerance at 30% by the machine shop with paperwork and then we batch check 50% to insure we don't have any defects. But there is always a possibility of one getting missed.

If you want to try another one I will specifically check yours before shipment so just let me know.

Chase@ECGS

 

@machineman89 That's what I would like to know.

 

Lots of dealers install the bushing and purchase them from us. It just has to be a good dealer.


See if in 4wd you have any noise when turning at speed this would get spider gears to move in 4wd, they do not move going straight.

The issue that the bushing corrects is an imbalance in the CV shaft which should only occur at specific speeds like 20-40 has been what we have recorded. The fact that yours has it at such a wide range makes me think you may have a wheel bearing issue. What year and how many miles on vehicle.

 

Red flag for me is "noise" everyones is different but I had vibes without any noise. I could feel it in the steering wheel and gas peddle, mine only had about 1000k in it when I installed my lift.

 

@ECGS what would be the ammount of play i should look for that shows the bearing is toast? i can throw a travel dial on the output shaft, any input would be appreciated

 

https://vimeo.com/164476454

 

Good to know.

 

As Chase said all about the dealer. I am pretty good friends with the owner. However I was strictly told that I would not have any warranty should something happen that involves that bushing

 

Well crap Chase @ECGS I don't know what the heck, lol. I don't even have 500 miles on mine yet 2016 TRDOR. Had a 2" lift done and not even 5 -10 miles it started with the vibe etc. Did not drive it at all till bushing got here then had dealer install it. Drove to work about 2 miles and didn't hear or feel anything. Drive home from work it was there as soon as I got going, 5 mile drive home. Engage 4x4 goes away however I really didn't do much turning in 4x4. I guess now that I think about it I did swerve left to right and no noise in 4x4. The vibe and noise are about 1/2 or just less of what it was with needle bearing so is definitely better.

I have an appt. Saturday to have lift removed, don't really want to do that. I just can't decide if I should just drive it a while and see what happens first. I have a 280 mile round trip Monday to Minnesota. I would guess it would be ok since there are guys who drive a lot more than that on the needle bearing and do not seem to have any issues or damage. Thanks for your attention Chase.