Dennis:
In addition to what Dave said, Chevy also required each of it's outside manufacturers (suppliers) to uniquely identify their parts. Some source suppliers used their actual name, some used initials, or a logo, and some just used some cryptic code unique to them. The engineering dept kept records of all the supplier codes. IF a certain part had common failures in the field, the zone reps who supported the dealers would relay the supplier's ID back to engineering.
Verne
