Gear Whine after regearing

4.88 whine rare, unless it's the normal Toyota whine (speed range says it is). What brand of gears?

 

Do you have a favourite make?

 

Nitros. It's the normal Toyota whine, but I didn't hear a thing before the gears.

 

Cheap turbo spool. I could be wrong but I believe I’ve heard that once they whine you can only fix it by getting new gears. Get it done right the first time even if it cost a few hundred more dollars. Buy once cry once.

 

This is how a properly set up 3rd member should look like showing perfect gear pattern , this is my 35 spline Ford 9" center section for my Camaro

Hopefully the OP's looks the same !!

 

Well in my case I went to a shop that specializes in Toyota’s and does at least a 2-3 of them every month. Still got whining. Don’t see it as cheaping out

 

Since we're showing off patterns, this is a 17 4Runner with an 8.2 elocker I did last weekend. I prefer a slight deep over a shallow pattern for strength and longevity. The gears did whine on the test drive, but it was so faint that you really had to listen. This coming weekend will be a 17 Tacoma sport with 8" rear. Getting 5.29 and a Harrop elocker.

 

Pinion depth and pinion preload play a role in this as well.

 

Nice pattern on that ring gear

The reason I've got a shallow pattern is that those are a Pro gear or "soft" gear for Drag racing . I'm running a Transbrake and a Street gear would shatter due to the shock-load

 

I remember we talked about this before. I guess drag gears are better with a slight shallow depth? Where offroad is better slight deep.

 

I have no experience with Nitro. I have tons of setups with Ford Motorsport (no idea who makes them, but they are C quality at best; I never had a set that didn't howl somewhat), several with Yukon (B), and most with Richmond (B) and Strange (one bad set in my experience_- my last setup was 2012, so things may have changed since.

 

Who would you consider A quality? OEM R&P?

 

I don’t understand this. You put aftermarket gears in a three year old truck, that had no whine, and then it started to whine with the new gears. You took it Toyota and they offered to help you, but could not get paid by Toyota Corporate, due to the problem being aftermarket gears, so you severed your relationship because they wouldn’t do it for free?

What am I missing here? The dealer guys sound like stand-up dudes.

 

I work for an OEM, so naturally I'm going to say yes, A+ (the aforementioned FMS is the exception), but I'd say Strange is a close second.

I'm not an offroader / wheeler like you guys; most of my builds have been high HP (relatively speaking) street / outlaw cars. The setup is close enough to be called identical.

 

You make good points. Also, the dealership guys have always taken care of me. I have no problem with the Toyota tech I worked with. He did everything he could to diagnose my problem and offered a next step if I wanted to work with Toyota corporate.

My issue is with the TSB process. The service department did a diagnosis of my truck and found that I indeed qualified for the diff whine TSB. Gears were not a part of the conversation, so, my response to the situation was the same as if I still had stock gears. The fix for the whine is just to install sound dampeners in the cab--not to adjust the gears themselves. Had I gone to the dealership when the truck was 2 years and 364 day old, they'd have fixed it. Had I gone on 3 years and one day, they would not have. At the time I was only a few months over the three year mark, had 100% of my service done at Toyota, and was still under ToyotaCare+.

The whine was there before the gears, but much quieter. I think it's ridiculous that known issues are treated like wear and tear problems. This isn't a factory warranty issue, it's another design flaw for the 3rd gen. TSBs only get applied when something goes wrong enough for a customer to have to do a substantial amount of research to ask for them. So, basically I found out about the diff whine TSB too late and now it's going to cost me. It sucks. I'll live.

 

I had revolution 5.29's installed a couple weeks back by a very reputable shop with the price to match, but I had really bad whine at 60-75mph on or off the throttle. Couldn't have a conversation in the truck without being super annoyed because of how loud it was. They said the pattern was perfect too which sucks. Just had a second set put in, after revolution told them to pound sand so they ate the cost of the gears and labor and re-did it for me, which is awesome. Told me today it went from about a 4 down to a 2 in loudness, but same deal with the whine. I pick it up tomorrow.

They told me to drive it again for awhile and get back to them if it's still bad for me, so I will drive it around and see how it goes. They will look into possibly putting nitro in the rear instead for the third try, but I'm super skeptical at this point. I've head nitros whine alot as well.

What do you guys recommend I do? They basically said they will still try a nitro set at no cost to me which is awesome, but I worry it will whine too.

Would yukons be a good bet? I'm sure I could just pay the difference and have them try these out. They assure me this is not common at all at their shop, let alone for a second install to still whine like this.

 

If you can go with Yukon I would do it. Whether Yukon whines as much as Nitro may be a matter of data points (Yukon is newer to the game for these trucks) but Nitro is fairly well known to have whine with the 5.29s in our Tacos.

 

Right on. I might try for that.

I actually just spoke with Yukon and Revolution. Yukon of course said their gears are awesome and shouldn't make any noise. Revolution dude told me they all make noise, especially yukons and nitro, but that revolutions arent as bad as the others.

He simply said the gear ratio and truck combo are just bad and that noise is super common because of this. According to him if I was to have it done a third time, even with Yukon or Nitro I would still probably have noise which is pretty crazy. He also said that the shop I took my truck to is the best in the area and he would only use them, and that even with a perfect gear pattern the noise is still common.

My brother who is owns a hardcore rock crawler flat out told me the shop just sucks, and if they did it right it shouldn't make any noise at all, no matter the brand.

Kinda torn on what to do since it sounds like a third try could be just as bad or more loud no matter what company I go with. Appreciate the input.

 

Would not recommend going with nitro as pro taco said. It won’t be a noticeable improvement. Bummed to hear one person say revolution whines. I’m beginning to think it’s an inherent issue with the drivetrain and cabin design.

 

NITRO does not build (acquired from Korea) a superior gear to a product that your local reputable rear end shop can acquire. After much research and many, many phone calls, it is advantageous to simply locate a seasoned ring and pinion shop with great reviews.

FWIW, it looks like Nitro doesn’t even have exclusivity rights to the product coming out of Korea. Ask your local shop about the serial number stamped on their gears.