You must read all shop manuals to all 73-87 (91) chevy trucks. There is a test to take, you must score 85%. I'll give you a hint, one question asks how to spell "ladder".
Sorry, I tend to be rough on people some times. Just ask my son. Sometimes he doesn't get my sense of humor. The answer is it has to do with the number of posts under your name. It's also nice to be a site supporter to keep this site up.