you likely searched the wrong terms or place folks have been regularly referred there, and it's mentioned in the tech tips, also some years are available at Keiths old chevy manuals site from back before GM put them online for free
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics
folks have been regularly referred there, and it's mentioned in the 