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Discussion Starter #1
Hey all,
I have a 07 DC Tundra TRD package pickup. 40K miles
I just noticed a harmonic vibration that starts when I start rolling and begins to die out at higher speeds. It is very noticable at 15-20MPH. I tried to keep my rpms consistent and noticed that it increases with speed and not RPM. I am wondering if the Stock BFG's have gotten out of balance or if something else has happened. Coincidentally I was driving in a field of grass before I noticed the vibration and switched to 4H at a stopped position and every light on the dash lit up. I turned off the key and tried to re engage 4H and drove out.

I hope my problems are not drastic. I just noticed the vibration and I am hoping its the tires or wheels being out of balance. I have not checked the tread, but perhaps I have a lag bolt in one of the tires.
 

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Check the weights on the wheels to see if one or more fell off. Anymore occurences of dash lights lighting up all at once? Check the wheel speed sensor connections didn't come loose. How tall are these grass?
 

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Sounds like you got the dreaded bad front differential too me, there are threads on this also a TSB from Toyota.

On mine it happens right after I take mine out of 4wd, only does it in 2wd and really only noticable under 35mph which is exactly what the TSB states.

Feels and sounds like the worst set of tires you've ever had, sound familiar?

Sometimes mine does it for several miles ... sometimes it does it for a short time, which is why I am still dealing with it after a year, the dealer says he can't duplicate it, seems to stop most times (other than once) right before I get to the dealership.

Its a pain in the butt.
 

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If you were off-roading you may have picked up debri or mud on your wheels or driveline that will sure make some racket. Especially if you gathered some mud on your wheels.
 

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Discussion Starter #6
I was not offroading, just driving slow in a lawn, under 5mph. The only reason I put it in 4h was that my balding tires started spinning. I do hear a clunk sometimes when switching from 4H to 2H This vibration seems to be getting worse as the days go on. I went to the my tire place last night and had them check bearings, wheel and tire balance and nothing, everything checks out fine. It is noticable under 35mph, and most noticible at 25mph. What is Toyota's Stand on this problem?
 

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I was going to say rotate the tires front to back to see if the vibration moves too. I've had two sets of BFGs that had a steel belt failure and no amount of mounting or balancing would fix that.
However, "Stock tires" and "balding" sounds like you'd be ahead to just replace them now and eliminate tire issues.
 

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Discussion Starter #8
It looks to be a bad front differential. I found a TSB for the front differential.
Going 0-35mph hear vibration in front in 2wd.
Switch to 4wd and hear clunk and vibration goes away.
switch back to 2wd and vibration comes back.

Thanks for the insight Trucker1976.
I took it to the dealer last night and they have heard the vibration and scheduled a visit for middle of next week. Hopefully everything goes well.

Thanks again
 

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No Prob at all, hopefully you will get your fixed the first time ... intstead like some of the guys on here and had theirs replaced once, twice even three times and its still not right.

Although their are some that had it fixed once and its done, I want to be one of those guys lol :laughing3d:
 

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Discussion Starter #10
I just got my truck back this week and it seems all is fine now. There is a newer TSB for the front differential now from Toyota that rebuilds the front differential rather than replacing. My front axles were fine, I had the tech take a picture of each for my records. Hopefully the problem will never show up again.

Thanks for all your help. It really shocks the service reps when you print out the TSB's and slap it down into their hands and say I have this problem.
 

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Rebuild rather than replace.......on the tsb......that's weird I think I would rather of had mine replaced. But I guess you had no choice since the dealer was doin the work for you under the tsb guidelines. Glad to hear you got it all straightened out though
 
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