213374U

I was always under the assumption that vibrations in the 10-12 AWD models was due to a bad run of front drives shafts and that replacing them with the updated version would fix the issue. Interesting to see that info Tec80, thanks for sharing .

Looking at that exploded view, I assume 2 washers would be needed? I'm at a bit of a loss though as to how changing that would tilt the nose of the diff up, unless of course it comes from the factory with the thickest washer?

Sailor54

Does anyone know when Lexus came out with these corrected drive shafts?

Tec80

You could try changing the rear transmission mount to get the same effect. The trans output shaft and the diff pinion must be within 2 degrees of parallel or less (zero preferred) to eliminate the vibration.

Tec80

You can see the effect if the diff pinion shaft and the trans output shaft are out of parallel.

fmast342

UPDATE: The first time I brought to the dealer they replaced the left and right front axles which seemed to improve the issue somewhat. However, I still experienced the vibration at times so I took it back. Now they tell me they took off the rims and tires from my car, but on rims/tires from another car and it was fine; so they will be sending out my wheels to be straightened out. This will probably be done by Wednesday so I'll let everyone know in about a week or so if it helped.

Sailor54

The dealer replaced the front axles last week. i took the car on a 2 hour drive and tried numerous times to repeat the vibration. I could not detect any vibration. what i find so odd (or maybe not), if that it took 5 trips to the dealer. In the very beginging i brought up the possibility that it may have something todo with the front axles. the dealers tech support never brought this up. I had to really press them to get this resolved. In fact the dealer said that there was no TSB on this which I find very odd. Tec80 mentioned shiming the rear diff. Apparently they changed vendors for at least some drive line parts as mine does not have the same setup as Tec80. Mine is a late 2012 model. The part nunbers for the updated drive axles are 43410-50014 and 434420-50012. there was a locknut on the list to but it doesn't say how many. it us 90080-17238.

fmast342

It been about a month now since they replaced the front axles and straightened out the rims and I would say the problem is about 90%-95% solved. There are times when I still feel a vibration; I would say I feel it most after first starting the car and getting out on the road in the morning. After I've been driving for awhile during the day I don't detect it as much.