Please help me, I'm attempting to replace the rear differential for my 89 300E, but I don't know how hard it is, what to look for and how to do it. I've done some minor repairs for my car before such as: replacing shocks, break pads,..., but never done any thing with the engine or transmission. I consider myself a fast learner. Please advise me as what to do, any infor is greatly appreciated. Thankyou very much for all your help.