The film introduction music/song. not the mediocre 7" single
I'm sure that's a Detroit (2-stroke) diesel, that's heard, as the RS700L is seen cresting the hill (not a fitment in Macks of that era, as far as I know - but maybe a retrofit?)
It's also cinematically wonderful
CW McCall
Convoy
View: https://www.youtube.com/watch?v=_R2RXE0feyI
Bit of a glaring (quite literally!) error, when the XK pulls alongside the Mack, & the camera-lights are reflected
As an aside, I wonder how one of these would look on the bonnet of my Kodiaq (maybe the black finish?)
https://pipinow.com/products/rdho