Originally Posted by countryraised
how much other towing have you done, is it turbo surge? it happens more under more load on the late 7.3s
Done A LOT of towing. Mostly my FJ40 on a flatbed. The boat weighs a lot more and stands up in the wind, too. If I were guessing, it sounds like exhaust gasses. Certainly could involve the turbo. Could the exhaust temp be getting too hot and the wastgate is opening or closing? Guessing here...
Turbo surge is ratchety, right? This is definately a smooth roaring(like a fan) whine.