rajiv123

Hey guys, I would like to see if i can get some insight into an issue I'm having. I'm getting some sort of a rattle/knock when driving over 70mph. I think time has something to do with it because I jumped on to the freeway and immediately hit 70 to see if I will get the noise, and nothing, it only happens after I've been driving on the freeway for about 15 minutes. I think it intensifies with RPM's but I haven't played around with the noise too much to find any other patterns. But this only happens at 70mph and up, once i get off the freeway, the noise goes away.

Backstory that might have something to do with it - A couple of weeks ago I went kayaking and drove over a graded dirt road that was about 1/2 mile long, maybe it shook something loose?

Any insight would be greatly appreciated!

Oh, it's a 1999 XJ 2WD with 208K miles.