NEW TSB, Whine Noise From Rear of Vehicle

It could be that the rear end vibrates at the natural frequency of the leaf springs causing them to resonate. They could make the springs slightly thinner/thicker/wider etc.. to raise the natural frequency above anything the rear end would produce.

Since on long beds they are not changing springs and the dynamic dampers on on the rear cab mounts. I'm wondering if the majority of the problem is that rear end is causing the cab mount bolts to resonate. Hence the damper on the mount and the foam above the mounts.

 

Yes, and so is my truck. That's what's frustrating about it...I have that axle, but apparently the wrong cab

Hopefully this is not the end of the campaign to "fix" the issue. My case is well documented at the dealership, as they've already taken two rather costly (under warranty) stabs at rectifying it.

 

Which is something Toyota should have picked up on and eliminated before going into production. It seems, after all that they've got it figured out now - right?

IMO, Toyota was probably aware that some of their trucks were exhibiting this little annoyance but chose to forge ahead with release to the masses and deal with it later.

 

Shoulda, Coulda. Personally? I think it's a hit or miss caused by stackup tolerances. Everything has a tolerance + - that is manufactured. In this case I think it could be a case of a few hundredths that are causing the resonance problem. You might go thousands of vehicles and not see it and then there might be 10 in a row. I've seen much stranger in my world. How about a metal leveling shim that was three thousandths cause a 600 hp coupling to shear? Sometimes, machines do strange shit.

 

What's with long vs superlong wheelbase designations?? Where is the documentation showing which models are which? I'm assuming DCLB is superlong, DCSB and ACLB are long ?

 

Personally, I'm not willing to let Toyota off the hook with stuff like this so easily. I've had almost all of the "issues" related to early production 3rd gens that you can read about on here. A good number of them I've sorted out myself, because I can turn a wrench. Others I live with. The question is though, why should I have to? Toyota quality, right?

I get it, nothing is perfect. But damn, if I can hear that axle whining over the sound system at a fairly high volume setting - it just isn't right. Nope, the thing probably won't grenade any time soon. It's just a noise, and a damn annoying one at that.

Anyway, despite its flaws I still enjoy my truck. I'm not on a mission to convince others that the 3rd gen is a POS (it's not, and BTW that crap has led to several perma-bans).

 

Has anybody with whine checked the rear diff oil?
I have a '17 PRO and when it turned 10000 as a gift I replaced the oils. Rear diff was 1qt low.

 

Mine was full.

 

Exactly. With Toyota I am simply a consumer. But, doing what I do for a living I definitely understand the customer side and the OEM side. The company I work for makes some of the highest quality components in the world and are used in the harshest applications. We also are the most expensive. People expect the absolute best. However, every now and then we F up. We do everything to the best of our ability and something goes wrong. Recently it was sub par sintered bronze bushings that one of our vendors provided. They had a bad batch, their testing didn't catch It, we didn't catch it with our testing either. The customer caught it, which is the worst. My point in our case is we did our best and still something slipped through. Toyota is good but they are not perfect and I know and accept it, just like our company. Just my opinion. I think it's funny when someone calls me a fanboy. I'm Not, I just understand how shit happens.

 

Mine too. My dealer checked Everything.

 

Just had my truck in for 20k service. Asked the guy if he had heard of other trucks with this symptom. He said "nope...no." Fucking liars. God damn at least tell me the truth.

Thank you OP for making this thread. I am stoked there is some recourse for this issue. I am not excited to have to make yet another trip to the dealer so they can fuck around and do the bare minimum to make me go away. I hope they don't throw up their hands when they take off my interior paneling and find my sound deadening material Ive already installed. I can just see them "it prevented us from reinstalling the panels correctly so we can't complete the work durrr".

 

How widespread do you think this problem is?

 

My dealer told me to take a hike. I called corporate and they denied it existed. I called my case manager and she said it did not exist and there is no solution. I asked for her supervisor and she denied and told me that's Toyota's position.

I then rerouted back to customer care and requested a case manager supervisor . Magically this supervisor could find it first try and completely contradicted everybody from the ground up.

 

I live in a Tacoma breeding ground; there HAS to be more than one of me that has at least raised the issue. I even had a tech drive my truck once and "could not replicate issue."

I am just sick of the lies.

 

YES! going to have my dealer do this my next service. Sick of the rear end whine.

 

My dealer sells around 400 Tacomas a year. I know I am the only one that had that problem. The service manager didn't even know about the issue and I have known him for years. When I called customer care, they immediately knew about the issue but had no known TSB. They told me the same line about normal. Now there is a TSB. I personally think very few of total Tacoma sales has this issue. It is way exaggerated here on the forum like everything is. But that's me.

 

Widespread enough to issue a TSB. And hopefully one or two more to include my rig haha I talked with the shop foreman today at my local dealer. He said he has replaced rear diffs and the howl went away. He has also replaced rear diffs to only have the customer come back 1k miles later with the new one howling. I'm not sure how many Tacomas with the howl they have dealt with, but it has been enough to make him and his top tech both come across as being very tired of dealing with this quirk ha His thoughts on this TSB didn't sound promising either, but I am a half glass full man! haha

He said I could probably purchase the parts if I like as he can't do the TSB on my rig (2018 SR5). At least that might be an option for me. He has a Toyota engineer in town this Thursday. He asked me to call him that day in case he gets any new details on the situation. He said he would ask what is really going on, but we shall see. This is really the only complaint I have about my truck. I love this thing as much as I love my baby 1st gen! haha

 

Exactly. The TSB is all the evidence I need to tell me Toyota has seen a significant number of complaints WRT this issue. I'm also blown away that it's still a thing, three model years into the 3rd gen's run (although some things have carried over since the 2nd gen was born!).
I'm going to wait a while and see if my dealership gets up to speed on this TSB. My case has been documented, two techs have rode along/heard the noise, and two expensive assemblies have been replaced outright trying to eliminate said noise. The hope is they will put 2 + 2 together and do the repair (my truck is an access cab so not covered by TSB yet). Don't get me wrong, they have tried to do right by me and I appreciate that.

 

I think I am going to admit my truck to the dealer citing "tone at highway speeds" and just print this out and leave it on the seat. I also have a clank from the front of the truck when going slowly over speed bumps etc that unfortunately for me only happens 1/3 of the time.

 

I am a Mercedes tech at a dealer & see this all the time. The car companies are worried about bad surveys & how to limit damage to profit it seems like. MB has released a lot of new product in past 4 years & you'd swear they haven't done any pre production testing what so ever. The GLC makes the 3rd gen Tacoma look like the most reliable vehicle ever made. GLC is on its 7th generation brake pad to fix brake howling when cold. It literally sounds like a train stopping. Latest & greatest pads still don't fix the issue. We have had customers that paid well over $50K for their vehicle & cant get a car with silent brake pads even after 6 trips to the dealer. Just be happy Toyota came out with a TSB.