Whilst the vehicle is in motion ( normal Driving) . when braking slightly or hard and then accelerating again soon afterwards, there is a loud Clanking sound coming from the rear axle or transfer box. this is so bad im afraid the pinion or crown wheel inside the differentials might break teeth. The backlash seems excessive or is this normal seeing it has permanent four wheel drive. I would really like to know what to do the nearest hummer agents are in south africa, 3000 kms away.