my 86 f150 makes a lot of noise when i let off the gas. sounds and feels like im driving over a rumble strip. all the u joints and wheel bearings are good and i cant figure out whats wrong

 

I cannot think of anything obvious, check engine & transmission mounts??

Sorry can't be of much more help!!

Billabong

 

Im kind of going threw the same thing but I know my problem is more of a vacuum or an intake problem. I had the rumble strip problem because of an unbalanced driveline but I only felt it, i didnt hear anything from the engine. The problem I have, which I havent fiqured out is coming from the engine which causes it to buck. Let me know what you find.