Vibration 15-25

If you want to get real serious about eliminating that mushy carrier bearing you can get one of these ( see photo ) but be prepared to get your shit perfect or you will feel e-v-e-r-y thing ! I feel like the compound angle due in a 4wd caused by the t case output shaft being off center from the rear axle pinion is the root of the evil ?

 

Agreed I believe that after the TBS fix which is engine mount, steering wheel damper, and different leaf springs. It will resolve 90% of the issue and I will still have a shim or a vibration.

If I have a little vibration I wouldn't even care. All trucks have a little vibration but its acceptable. But the vibration I have is not good at all.

 

From what the mechanic at Toyota told me was that the end of the drive shaft that connects into the diff when under acceleration is pushing down on the diff causing the vibration.

 

Velocity changes in the U joint during higher revolutions??

 

Toyota called me and informed me that the leveling kit that was put on it wasn't toyota there isn't covered under the pre owned certified warranty and isn't covered under any warranty that they sold me. So in all reality I bought I Pre owned certified toyota that wasn't certified.

They are taking the leveling kit off and start the trouble shooting there.

This has caused me so much headache and time lose and miles and gas.

Does Toyota make a lift kit that is OEM approved for warranties?

 

Thats a crock of crap. They're just taking the easy way out.

All of the new Trucks at the dealership that are lifted are built out. I worked at 4wheelparts and we built at least 3 tacomas and 3 tundras a week for different Toyota dealerships in the area. Ask to speak with a supervisor. A lift is a lift, We put anything from spacers to coilovers on brand new tacoma's. Also did hundred of trucks a month with low mileage and never had or heard of an issue about warranty. I had my truck in for a whole new rebuild of my rear diff and they repaired it under warranty. My truck is lifted 3"/2.5" Front/Rear with 33's. No issues and everything was paid for under my 75k warranty. Ask to speak with a supervisor and call corporate if they give you any excuses.

 

That sucks. That's why I was confused about the pre owned certified. They screwed up and now you're dealing with it.

If they give you anymore grief start a claim with Toyota directly. You bought and paid for a certified pre owned vehicle. Plain and simple.

 

its a combination of things.

Mainly the vibration is caused by axle wrap (due to the soft rear leaf springs) The axle wrap fucks all attempt to get to a somewhat close to proper driveline angle, and REALLY increases the center u joint angle, where almost all of the 15-25mph vibrations come from in the form of deflection of the mushy center carrier bearing.

In the TSB:

The rear trans mount lowers the trans / tcase ever so slightly. Reducing slight the downward angle of the U joint at the tcase/trans. The stiffer leaf springs lift the rear of the truck slightly (bringing the center u joint to a close to 0 angle) as well as turning the pinion DOWN to the ground depending on shim on the leaf pack to closely get to the angle (in an opposing direction) of the first u joint (the one at the tcase/trans)

Now that would be all proper BUT, the stock u joint phasing with the two extreme ends at opposing angles and the center at 0 causes higher speed vibrations (round 60mph or so) due to the 90* out of phase the opposing joints are now. That stated that 60mph vibe is MUCH better than the heavy 15-25mph vibration.

Im thinking of popping apart the slip joint on the rear section of the driveshaft on my 4x4 (prerunners dont have it) and seeing if i can turn the rear section 90* and slip it back in. Yes the driveshaft balance will be out as its balanced as a system, but those vibes might be much less then the slight vibes of the out of phase u joints. But thats down the road.


I have done so much to try and get all the vibes out of my truck, Trying so many different carrier bearing positions with different rear pinion shims.......Really in the end it comes down to this. The center carrier bearing is tooo mushy. I was able to get an almost proper driveline setup. I had 1.2* of downward angle at the tcase. 6.5* downward at the center, and 6.3* upward at the pinion. The center u joint and pinion were just about perfect to cancel out the inherent velocity changes in a u joint. and the 1.2* down at the tcase is negligible.... i was actually all within the proper parameters of the spicer driveline specialists.

With that the truck was PERFECTLY SMOOTH if i was light on the throttle as it should be with those angles. BUT get in her from a stop and the side loading that happens on a u joint due to an angle caused the center center carrier bearing to deform and the driveshaft actually oscillates in the rubber within the carrier bearing. This is the main cause of th 15-25mph vibration, and is why after the TSB you will notice the center u joint is almost 0.

I could go on and on. At this point my truck is decent, i have a smidge of 10mph vibe from the center bearing due to my lift but overall its not bad. I know i could ALL of it out if i. 1. Stiffened up the center carrier bearing some. 2. rotated the slip joint 90* and 3. dropped my CB by about another 1/8 of an inch.

 

Sounds like a combination of the angles and multisection drive shaft?

Two Dumb questions - as I really don't know ....

- What would happen if the driveshaft went directly from the tranny to the diff ? I've seen trucks with really long drive shafts.

- Could a CV joint be retro fitted instead of the u joints? Would this help??

 

my money says that removing the carrier bearing bracket and turning it 180 (and reinstall) would make this go away...

 

Wow thats a lot of work that it seems should have all been figured out by Toyota. Honestly I expect more them these trucks. I would expect I could get a 2013 Tacoma and lift it 3 " and it be ok with out much change.

Today they called me back and said that they took the spacer out and test drove it and its still causing the vibration. From what you guys have been staying that makes sense.

They offered to put a ToyoTec 3" lift on for free to compensate me should I ask for anything else?\

Oh and I almost for got now that the front level kit has been removed they are going to perform all of the TBS solutions leaf springs, steering wheel damper, trans mounts.

So if they do all this and its still vibrating then what should I do?

 

I'd let it go back to stock and not accept it until the vibs are fixed. If they can't fix it you get your $$ back or another similar truck deal. IT sound to me that the dealer want's to get the TSB labor work and throw in the Toytec lift and say - you are on your own - because it will then be non factory. The newer vehicles today are just to expensive to gamble with ....

 

Holy good night look at that thing.

 

No they will warranty the lift when they put it on. They might have to make more adjustments when they get it on to make it right. But like stated earlier someone had mentioned that they had done multiple lifts to trucks personally and had never had this issue.

I guess what I'm saying is it isn't the lift its the vehicals drive line from the factory.

 

OK - but I'd get it in the work order that driveline vibrations will be resolved.

 

Go For it and good luck !

 

They preformed the TSB and its great eliminated all vibration. They also replaced my front spacers wand struts with Bilstein 1500's. All and all a good day.

 

Thats good to hear... Glad it worked out.

 

Congrats!