Ok I Have A 2002 Chevy Suburban 2wd It Started Wit A Loud Crackin/knocking Sound In The Under So I Lifted It And Found A U Joint Was Damaged So I Went Ahead And And Replaced It The Cracking Sound Disappeared But Now 3 Days Later I Heard A Not Tat Loud Knocking Noise We I Let Go Of The Throttle At 20-40 Mph Wat Can It Be?
