I don't know why it's necessary on these trucks, really I find it noisier in the city than out on the highway. So dam quiet this truck (knock on wood) no wind noise like every other vehicle I have had. I have had Cadillacs, and other luxury vehicles older of course but still never as quiet as this . Never have to fiddle with the volume due to speed and if I did was cuz I like the song and want to crank it. Now I will have to search, is it on the engineering page on the radio?

 

I have an '09 Sport w/ the Alpine sound system (REN radio), and I don't have the speed sensitive volume (at least I don't see it as an option in the audio setup).

I had it on my '99 F-150, and it was nice, but I agree with 72combo - these new Rams are so quiet it's not really needed.

 

2010 RBZ here too. I know it does it, but can't find an option for it.