During rebuilding of the Advance Design cab, the hobbyist will observe remnants of a tar paper material secured to the underside of the roof. This was partially for insulation but even more as a noise retardant. This reduces the bell sound in the cab when driving or slamming the doors.
When restoring your truck, be sure to replace or improve this material under the roof. Tar paper secured with layers of home roofing cement works well. It is not visible once the headliner is in place and will add to the quietness of the cab.