Putting a hold on the build

So a quick update. Got the 4R back from Youngs - guy there (former Toyota Tech) said they checked all the fluids, shifted in and out of 4WD, drove it, etc. and could not find anything or noise out of the normal that would lead them to believe there was anything wrong with the drive train. He said it could be the boots with the lift on the truck, but nothing he could find.

Yesterday, on the way home from work, the noise was back - pulsing/whirring as before - kinda seemed the slights bit louder. Thinking about it (since it wasn't making the noise when I took it in to Young's in the morning), the noise is more prevalent after it has been sitting outside in the cold (10-25 degrees up here recently). In the morning, after sitting in the garage, I don't hear the noise. After the morning commute, it is barely there. So maybe it is what Todd was describing? I'm hoping this Friday (shorter work day), it will be making that noise, and I can run straight to Young's and make sure I'm just not paranoid about a sound.

Also, when I installed the lift - I took out the bump stops in the back, and did not put the rubber ring back on the top of the COs - so am I just getting more road/machine noise w/o those pieces of rubber acting as sound absorption points?
 
That's identical to my situation. My truck sits in the garage overnight so there was no noise in the mornings.

After it sat out in 5-10* weather while I was at work it make the sound. If I drove it to the dealer they couldn't replicate it. So I left it sit overnight at the dealer on a cold night. The next morning a tech and I went for a ride and he picked up on it instantly. In 2WD it would make the noise, as soon as he shifted it to 4x4 it would be silent.

This was a common problem on the 2010s and I have an early build 2011 so I must have had an older front axle. After changing the diff fluid the problem was still present so Toyota authorized the whole assembly to be replaced. After that life was good.

I believe it is T-SB-0175-10.
 
IAmTodd said:
[...]

This was a common problem on the 2010s and I have an early build 2011 so I must have had an older front axle. After changing the diff fluid the problem was still present so Toyota authorized the whole assembly to be replaced. After that life was good.

I believe it is T-SB-0175-10.
Click to expand...

nvm - I'm an idiot and didn't see the case number in your post - thank you!
 
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IAmTodd said:
I speak of the axle (the full assembly mounted to the frame), not the axle shafts which contain the CVs. From my understanding there is an issue with the early carriers, with the drivers side spinning and the passenger side stationary it creates an imbalance. Later hardware fixed the issue.
Click to expand...

FRONT AXLE HOUSING & DIFFERENTIAL. Fits: 2010 TOYOTA 4Runner | Village Toyota Parts

Is this the assembly that you were referring to? Also, the TSB you listed said it was:

104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
105500 POWER TRAIN:DRIVELINE:DIFFERENTIAL UNIT

Did they every tell you when you got yours replaced which of the two, or does that assembly take care of both problem areas? I also take it that Toyota won't pay for the repair since I'm out of the factory warranty...:(
 
Agreed that it is not the t-case.

putting it in 4hi does not disengage anything inside the transfer case that is being used in 2wd. So if it was in the t-case the sound would be present in 2wd and 4hi.

Also, most Toyota techs are not trained in very good troubleshooting, it's more of a parts replacement and hope for the best kind of thing.

It would be a huge pan for you to get a used transfer case and have it installed only to have the same problem.
 
FWIW - This is what the front diff looks like:
toyota-add-front-axle-disconnect.jpg


The actuator on the right side of the differential is the ADD system and servo. If something is loose anywhere in the front driveline it could cause noise when unloaded (in 2wd) and then tighten up when in 4wd and slightly loaded. Sometimes it can be really hard to diagnose exactly where it's coming from because it could be any of the bearings that makes noise at just the right frequency (speed). I'd start with cv axles because they're cheap and it's nice to have trail spares anyway. If that doesn't stop it, then I guess it's time to look at the diff. assembly. You might try just the actuator first - if it's not fully disengaging it could cause some noise.

Good luck.
 
I haven't done anything with this item yet. I've kinda been living with it :-\

The TSB says its the t-case / diff. My guess is what everyone else has stated - issue is the diff, jetboy makes a pretty compelling argument for the ADD.

The unfortunate thing is I noticed this after I put on my boss setup, but at the same time I didn't notice the noise until it got near or below freezing. So I don't know if it's a combination of the two (would a 1/4" diff drop really make that much of a difference, I don't know), or just one of the factors.
Sorry that probably doesn't help - are you experiencing the same issue?
 
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