At highway speeds I hear and can feel a very slight harmonic pulse vibration. This is not a wheel balance vibration. Typically hear/feel it @ 60+ mph. At first I thought it was an exhaust drone due to the fact that the noise ceases when I let my foot off gas. Would a wheel bearing continue to make noise when foot is not applied to gas? Wheel bearing, exhaust, or a front diff whine? I dont hear it at lower speeds.

 

Maybe start by greasing the driveshafts and see if anything changes? That would likely stop when coasting.

 

I had the same issue not too long ago. When I drive the truck above 30mph I would hear what seemed like an exhaust leak. The best way to determine if the wheel bearing is bad is to lift up the truck and shake the wheel. The wheel that wobbles and shakes is the one with the bad bearing. My Stealership wanted $1700 + tax to get it done. I ended up doing it myself. I bought this bearing https://www.ebay.com/itm/2003-2015-4...y/151386954892 and it took me about 2-3 hours to get it done.

 

Since your issue only happens at higher speeds this will make it tougher but one of the easiest ways to test for a bad wheel bearing is to get it up to the speed it makes noise and then make a sharp turn in each direction. If the noise goes away in one of the directions that a good sign you have a bad wheel bearing. That's how I was able to diagnose mine. Granted, mine was absolutely shot when I bought it and would only have to go about 20 mph when it would start to make noise.

 

Did the sound go away when letting off gas?

 

Yes it would kinda subside.

 

I had this "drone" type of noise.
Lexus has a TSB out for my problem.
Dont know if this applies to you but here is the bulletin:
https://www.clublexus.com/forums/att...-vibration.pdf

Lexux did mine and my issue was solved.

 

When did they do it? That bulletin is 11 years old and could address my issue, but I'm wondering if it's expired by now.

 

TSB is not a recall. You would still have to pay them to do the work unless they "goodwill" the labor for you.

 

Not typically how it works. TSBs are usually a free repair. You are correct that a TSB is not part of a recall campaign, but is done on a vehicle by vehicle basis if owner has that issue. Typically the fix is covered at no charge to the owner.

 

Thats false. TSBs are never a free repair unless specifically stated in the TSB, the vehicle is in the warranty period, or they are "goodwilled" by the manufacturer if out of warranty. Most of the time they do end up being free because almost all TSBs come within 1-2 years after a vehicle is released and thus vehicles are still in the warranty period. TSBs are at their core, just a bulletin with instructions on how to repair a specific common complaint. Google it

 

I just looked at my records at i had the TSB done back in 2009.
I was still under powertrain warranty so it was covered.

As Muff mentioned, TSB is not the same as a Recall.
Recall's are a safety issue and for i know, doesnt have an expiration.
TSB's for the most part only last till your vehicle is still under warranty.
Unless there was a warranty extension on a known issue.
That could last a certain date and/or mileage. ( i missed out on the dash crack extension :-( )
Fast forward 2015.
My T-case started chattering upon stop light hard accel.
Took it to the dealer to hear some bad news since im way out of warranty.
To my surprise, Lexus Goodwilled the whole bill. Woohoo...!

You really need to get your issue properly diagnosed first and go from there.