Driveline vibration Tsb out

I had some time to crawl under my truck and check the torque on everything that was worked on during the TSB. I noticed the carrier bearing bracket was sitting where it originally was so I loosened it up and shifted it over. It lessoned the vibe but its still there, You might want to check yours.

How much play should these carrier bearings have? When I unbolted the CB completely I was able to rock the bracket that surrounds the rubber insulator back and forth. Once its bolted up I'm able to move the shaft about 1/2", does this sound normal? I'm thinking either we have bad CB's caused from the rear shudders and vibrations before the TSB or my driveline angles are still off after the TSB. Has anyone removed the leafspring shims? Are they part of the leaf pack, I'm thinking about removing the shims and seeing if that helps.

 

After a two month long fight with a non responsive dealership (a call to the 800 number lit a fire), I finally took got my truck in for phase I: steering wheel damper, engine mount insulator, and measurements. The shop was cool enough to let me shadow the tech working on my truck and verify his methodology. I was happy to see they were prepared and educated on the TSB.

The insulator appreared identical to the one that came out. They replaced it anyway. Here are my measurements:

F/A – P/A = J/A

-4.00 – (-4.50) = +.50

Following the chart for my LWB Double Cab PreRunner, I have spring assemblies with 2-degree caster wedges on order. Fingers crossed.

-Jeff

 

I talked to a Toyota tech yesterday at a different shop than the one I had my TSB done at and he confirmed what I had already assumed. Since my TSB all my acceleration vibes are gone but I can still feel that driveshaft rhythmic vibration at 25-27mph under decel, and a slight vibe between 57-60. He said they've done several at their dealership with the same results and their currently isn't any other fixes out. My truck does have the insulator, leaf pack, shims & steering damper.

 

this has been discussed before.... the decel vibes are because the rear suspension is upweighted and pinion angle increased.

the rythmic vibes are due to the now 90* out of phase of the transmission u joint and pinion u joint.

Does any one know if the center slip joint (found on the 4x4 driveshafts just after the center u joint) are splined so that they can be rotated 90* and slid back together? I might pull mine apart and see.... i can almost guarantee that with a center u joint angle close to 0* if i spun the rear shaft on the spline 90* the rythmic vibes at 60ish will go away.

 

Had mine done this week, picked it up Tuesday night. There was actually a Toyota tech at my dealership the day the TSB was done, and he drove my truck to check it out. The 20 mph vibe is gone, but I did notice the 25-30 mph decel vibe discussed above. Here is the strange part: I read through the TSB, and as far as I can tell, the steering wheel damper does not involve the removal of the steering wheel. But on the way home from the dealer after having the TSB done, and all day today, I swear I've noticed that the steering wheel is slightly turned to the left all the time, just a few degrees, but it's annoying. A couple of times when no traffic was around and on a flat street, I put the steering wheel straight and drive forward, and my truck turns to the right. I never noticed this until having the TSB done this week. Any thoughts? Could this possibly be the result of the TSB?

 

I noticed mine drifted to the right as well, d*mn. I changed my tires a few days after the TSB to a bigger size and just assumed I needed an allignment so I went and paid for one. After the alignment it feels better (subconsciously) but I still think it pulls to the right. The fact you mentioned that pretty much confirms it. The roads up here suck so its hard to tell sometimes.

 

Is the out of phase something caused by the Tsb or was it always prevalent on these trucks and is more pronounced with the Tsb? If the tsb caused the 60 mph vibs I'm thinking about going back to the stock trans mount and removing the shims. My trucks highway manners are terrible now.

 

its the way the driveline is setup. The reason they become "out of phase" is because instead of the center and rearmost u joint being at opposing angles to cancel out the inherent vibrations of u joints. this tsb leans more towards the front and rear u joint being at opposing angles but because of that the joints themselves are 90* out of phase.

 

I emailed Toyota today about this, just interested to see what their response is.

 

The crooked steering wheel happens sometimes because there is a slight amount of clearance between the leaf spring center pins and the alignment holes in the axle perches. The clearance can allow the axle to be mounted so that it is not square with the frame (meaning each side can be independently moved slightly forward or rearward of each other. If the axle alignment is not square to the frame, it will slightly "crabwalk" and the front wheels will steer in the opposing direction to compensate. Had it happen on mine when the leafs were changed. What I experienced was that the axle would attach squarely only when the u-bolts were tightened and torqued while in the air. Two ways to approach- correct way is to realign the axle (square to the frame), alternate is a new alignment with a 0 deg. steer ahead.

 

Thanks for the heads up... I will be sure to mention this if I ever end up back at the dealer. When I had the front aligned at the dealer I didn't get a print out but they claimed it was "within factory specifications" and I still feel the crabwalk you described. I always suspected it was the rear axle.

 

Thanks. Glad to know I'm not going crazy. Guess it's back to the dealer!

 

I was just thinking about doing that today, please be sure to post Toyotas response.

 

You mine as well contact them too if you were going to, then they will know it's not just an isolated incident.

 

I took my truck in today for two issues, the loose drivers side cv shaft at the differential and drive line vibration. I just started really noticing the vibration and wanted to get in on the TSB before I was over mileage. What I really wanted was the 3+1 spring packs but I guess I'm not getting them, they are going straight for the new drive shaft without doing any of the other steps. Is this something new or am I literally getting the shaft? Of course I want the vibration fixed but I really want those springs as mine are already starting to sag.

 

I heard back from Toyota via email. They basically told me to go pound sand until I can have the dealer look at it again.

 

Well that's not what I was hoping to hear. I will send an email tonight and see what kind of response I get. I just went camping over the weekend and was dreading the 6hr ride because of the vibration, but about 300lbs of gear in the bed smoothed her right out. I was a bit disappointed the TSB leafs were on the overloads like my 3 leafs always were but to my surprise they were much more controlled over the bumps.

 

I took my truck in today to have them look at the vibration and they verified that it is an issue. They ordered the mount and damper but said they were going to wait on the springs. I am hoping this fixes the vibes without introducing a bunch of the other problems mentioned here... I will update with my results, they expect the parts to be here within a week.

On a related note, it seems like they reset the trucks computer, lost all my radio presets etc. Anyone know why they would have done this just checking the vibes out?

 

I was at the dealership today for warranty work (battery crapped out) so while I was waiting I looked at all the double cabs they had on the lot and they all have the 4 leaf pack, but no shims like they have installed on most of ours. Do the 2014's still suffer from the takeoff shudder, why no shims on the new trucks?

 

as i have stated before.

All 6lug 2014's made after october 2013 have 4 leaf packs regardless of wheel base or package. They still have the take off shudder as they are not the same 4 leaf packs as the TSB, and this is why the TSB covers 2014's