Front end whine/vibration at 25-30mph while in 4hi - no lift

Woulda, coulda, shoulda....

 

Sorry to revive this 2 years later hah, but did the OP ever figure out what the issue was? I think I have the exact same issue in 4hi around 40-45 km/h. There's a very distinct rubbing/vibrating sensation that you can feel through the pedal at that speed

 

I'm sorry I can't help more but nothing really ever came of this situation for me. I forgot that I was even concerned about this until I saw your post now... lol

I'm guessing I was a bit more worried about any noise I heard since it was my first brand new vehicle, my first four wheel drive and nearing the expiration of my warranty.

I have change my fluids on a recommended schedule since then, now have over 100k miles on it and have not had any problems.