Toyota unable to figure out vibration

2007 Tacoma Sport 4x4 with Yokohamas and Skyjacker suspension.
Have vibrations at 20mph and 40mph that go away in 4x4. Have tried a homemade center bearing shim that seemed to help out the 20mph vibs. Tires all balanced, rotated, and alignement is spot on. No vib in steering wheel.

Finally brought the truck into Toyota. They tech said that he could feel and hear the vibs at both speeds but after 5 hours they were unable to tell where the noise was coming from. He stated he checked everything he could and used a microphone. I had to pay $90.00 even though they didn't diagnose the issue. I was a little irritated with paying so I spoke to the manager. Ended up paying anyway. I understand that people have to make money.

The kicker...they told me to wait until the noise gets worse and then they will fix it for me under the warranty...even if it expires. I've never been told that one before but they were decent about it. Took it to a driveline specialist. He stated that it shouldn't be the transfer case or any of the gears. He thought it may have been the center bearing. He showed me a spot that may have been rubbing inside the center bearing. I'm so fed up that I sprayed WD-40 into the center bearing tonight and drove it. No change. Hopefully one day I can figure out the vibs. The biggest thing is the tech. said that everything looked great on the truck so the vib must (hopefully) not be causing damage! Just wanted to update you guys.

 

I agree with the tech about letting the noise get worse, it would make it easier to spot the problem. I've been in that situation a few times but if it's bothering you, carry it to another dealer and driveline specialist and see if they can find the problem.

 

hope you get it squared away man. maybe they need to swap out the driveshaft.

 

You are not alone Devil Dog...... I have been going through the same issue. I think the problem is the two-piece DS on the DC models. Shit is driving me crazy, and I have spent countless hours on it. I am about to put my shit back to stock and say the hell with it!

My recent post -

http://www.tacomaworld.com/forum/su...after-ome-lift-need-help-resolving-issue.html

 

Me too! I have spent so much time getting the vibs out of my truck, got them almost gone and now am getting a vibe when under power or climbing grades!

 

I've got a vibe I'm diagnosing right now too.

Have you guys checked your driveshaft flange angle? I talk about measuring it and correcting it with shims in this thread:

http://www.tacomaworld.com/forum/su...talls-full-ome-kit-rear-brake-lines-pics.html

There are links to two really good, authoritative articles in there that you may want to check out.

 

have you tired putting on a carrier spacer ?