Recent DEG Inquiry 36129 made updates regarding R&R Frame assembly to an “S” Structural classification.
CCC end users can submit DEG inquiries relating to component classification for frame R&R HERE.
Note CCC GTE MOTOR Guide to Estimating – Component Classification (cccis.com)
“The purpose of classifying components is to describe physical properties of the component. Indicators are not intended to determine labor rates charged, or to be inclusive of all components.”