[sicarius682]

hey guys.i have a 1983 chevy k-10 with a 350 and a th-350 trans. every now and then it will start violently shaking as i'm going down the road. almost feels like it's trying to engage into 4WD. but if i pull over and stop it will quit and i can resume driving. it was like every couple of months and only when i hit a large bump but now it's becoming more and more frequent to where i can't drive it. i've replaced the u-joints on the drive shafts, the manual lockout hubs, wheel bearing etc. i had decided it had to be the transfer case but my gut keeps saying it's the ball joints even though they feel good when you check them. any advice? want my truck back.