Dear Experts,
i own a mehran 2011 VX CNG, i have kept the car simple and clean. i am facing a problem which i will try to explain to you guys as i have failed to make any mechanic understand the same. here it goes, when i drive my car with speed above 40KMS or with two passengers sitting at the back then car runs without any sound, but when i drive car slow and alone like only 1 or two passengers then there comes a very annoying CHUN, CHUN sound from the back of the car, now i think, i repeat i think that its coming from back suspension i.e. kamanian are making that sound, i want to get rid of that please suggest me what to do.