Vibration in steering wheel (not tire related) at certain speeds ('15 LE)

[SkidPalace]

Hi Everyone,
So I am spinning off a thread about my vibration issue on my 2015 Limited Edition. I have briefly muddied up this thread regarding a low speed judder when making turns, but my issue is different in my opinion.
In my case I am getting a vibration that can be felt in the pedal, the wheel and the floor when at a cruising speed between 30 and 40 mph and applying moderate acceleration to approx 1500 rpm. This occurs in a straight line and seems more pronounced when turning (at the same speed and rpm).
Has anyone else with an 5th gen (not even sure if this is an LE specific concern) experienced this?
I brought it into the dealer and they have reproduced the condition, but did not know if it was normal behavior for the truck and had no other LEs available for test drive to compare it to. They did take out a non-LE and claimed they felt it but not as pronounced. The skeptic in me thinks they are full of shit, but I am open to opinions. The dealer ended up lubing the drive shaft and sending me on my way, but that did nothing. They want me to bring it back and leave it for the day so they can diagnose it with Toyota if the issue persists. It does.

 

[philsey]

Try repeating the process in S-4. Don't know if the newer years have better trans software programming but earlier years (mine for sure) tended to hunt between 4th and 5th gears at low rpm, provoking similar symptoms.

I always drive in S-4 around town, as the above attribute annoys me.

 

[mattr]

Did this start from new, or did it appear over time? At what mileage?

If this is something that happened not from new, I would say the driveshafts on our trucks need lubrication and unfortunately even the dealer techs in my experience don't do it properly. It's easy to do yourself and there are good instructions on here. I would recommend doing it yourself on all 6 (I think it was 6, I might be wrong) zerks even though the dealer told you they did it.

http://www.toyota-4runner.org/5th-gen-t4rs/117523-prop-shaft-greasing.html

 

[m85476585]

Does it go away when you lock the center diff?

 

[SkidPalace]

Did this start from new, or did it appear over time? At what mileage?

If this is something that happened not from new, I would say the driveshafts on our trucks need lubrication and unfortunately even the dealer techs in my experience don't do it properly. It's easy to do yourself and there are good instructions on here. I would recommend doing it yourself on all 6 (I think it was 6, I might be wrong) zerks even though the dealer told you they did it.

http://www.toyota-4runner.org/5th-gen-t4rs/117523-prop-shaft-greasing.html

This has been happening from new.

 

[SkidPalace]

So to add more info, I realized yesterday that the vibration which could also be described as a hum or a moaning sound actually continues right up to between 50-60 mph and possibly beyond. It will occur even in S4 or S5. The vibration /sound will also oscillate as you drive for example on a slight grade where you need to apply light throttle to maintain speed.
I haven't tried it with the center diff locked but will try it today. I will also try to shoot a video, as I think it is loud enough to actually be heard on an iPhone.