On a 2001 LB7 4wd crew cab. I am getting a vibration from the rear end. It only happens on acceleration From a dead stop to about 30mph then it smooths out. I’ve replaced the carrier bearing, checked all U joints, rear shocks, transfer case, leaf springs and they all seem to be fine. Wondering if anyone else has had this issue and what you did to fix it. It’s a lot worse when I’m pulling my trailer but again it will smooth out after getting up to speed. Is this considered the so called Chevy shake? Any help is appreciated!