Mine does it to! Also in CO..but Iāve noticed anything below 32 degrees it whistles. The colder the louder! Even if I open the window itās still there so I think itās actually coming from the top not sealing correctly and not the window. Right above the roll bar area above passenger window.
Thank you!
Lift:
https://fordrangerlifts.com/shop/ols/products/xn-big-bronco-bigfoot-lift-3-front-and-2-rear-2y40ama?fbclid=IwAR0e1WUgHBCiDKXBNm_Mxj4vO6yLz_9GRlwtB6PT12GffecQKDocMlqPYoI
Tires are 37ā KM3s and wheels are stock Sasquatch. Also did camburg UCAs