2000 GMC C3500 Sierra SLT 8 Cyl 7.4L
whats the purpose of a fly wheel and an image of the part?
One of the main purposes is to provide a connection for starter to turn engine over. It can vary in size depending on engine. Placed between engine and transmission , Looks like a large frisbee with gear teeth on edges for starter to engage into upon turning ignition. I don't know how technical you wanted to get.