Problems with a Jeep Grand Cherokee

Hello, I have a problem is when it accelerates while I am walking a buzzing is heard but the noise disappears in descents and in curves but when I accelerate again the noise appears like a buzz and when it stops I accelerate and there is no noise but only when I am in motion.
Change differential oils greased because it seemed to be something of the body but remains the same.
If anyone knows or wants to think please help

For me they are recaptured the crossbows ... or your masses !!

Hello J-Rdiaz.
Check the differential, there is probably wear that can be solved with a small adjustment and also check the masses, as Jazuke tells you. Luck.
Miguel

It seems to me because of your data that your problem is in piñon rulee but you should change those of the crown also in case I did not understand you by pulling cusondo loosen goes away or is less in a fixed one that you would have to start there. I agree with the previous 2 colleagues

Hello, apart from thanking them for your councils, I tell you that it was a crosshead, thank you very much.