bought 4 used 16/75/315 bfg rubbers and had a shop install and balance them. now i have a really bad vibration around 45 and 60 mph. took them to get balanced again and no better. also noticed balance weights on the rear tires halfway around the rim on both sides and same angle. i can see the box of the truck shaking as i drive so the rear tires r the problem. what has me stumped is that when driving straight the vibration all but disappears, but going around any corner brings back a vibration that honestly makes it hard to keep a conversation going. then its gone. what kinda unbalance comes and goes? any help is appreciated....going to check drivetrain components in the morning to eliminate that possibility.

 

Ply or tread separation vibration changes with rotational speed and side force pressure on the tire.

 

one tire ended up being out of round....not sure how and y that would cause the vibration to come and go but that's what the shop said.

 

Don't buy used rubbers. It is nasty and always leads to problems.

 

now i know maybe ok if rubbers r still on rims?