Hi new poster, i have a 311cdi mwb panel van approx 56000mls. Its been into merc main dealers twice but the problem still not sorted. When you start off in 1st gear, through to 3rd gear and only up to app 3000rpm, the rear wheels give off a screeching noise and loose traction fpr a small amount of time then regrip. I've tryed the van with different weight variations and if anything being fully laden makes the problem worse. the dealers have had all the computer eqipment on it and found no problems or fault codes. I'm convinced theres aproblem with the traction ASR somewhere. any suggestions please karl.