I bought the DVD's for an '01 S430 with a noisy rear end. It showed step by step how to remove the unit from the car and how to take it apart and put it back together. After seeing the complicated and precise procedures not to mention specialized tools required, I decided it would be better just to get a used one from the junkyard but the DVD's paid for themselves in the just the R&R information. Sold the car but cant wait to get another late model Benz that needs some work! I had to buy a DVD player and the DVD's may be a bit complicated to install but the seller was helpful and once on your conmputer you are set for life.