Humming at 70mpg

Hello everyone, I was just wondering if anybody has encountered an issue with the spiral cable being replaced at the dealer for free about the recall on the Tacomas, because I just got mine done 2 weeks ago and, I wasn't able to drive my truck on the freeway at a high speed because of traffic when I was coming back home but there was a little stretch where I was able to push 65 to 70 miles per hour and the truck started making a sound like a loud hum or kind of like a rattle, and it was not doing that before the repairs were made from the recall, so I was just wondering if anybody else has experienced that. I am taking my vehicle back to the dealer because it had never done that before it started immediately after the repairs were made. please let me know if anybody has any info or if anybody has an idea of what it might be when it comes to the humming noise that starts at 65 to 70 miles per hour thank you.