i have an 81 k-20 a few days ago i was on my way to work and my truck got a really bad vibration- like i'm going over speed bumps on one side of the truck, it happened when i hit about 30-35 mph, i got the truck home and found my rear shocks are shot, and one is barely even on, i haven't driven it since, and i know i need shocks, i don't need anyone to tell me that, but could that cause the vibration