Originally Posted by Peppuccio

Hi,
no it is not normal ! The problem is that the top cover is too tight and don't fits on the rear diff crankcase. Isn't easy for me to explain in english what you have to do but I try: you must reduce the tooth of the internal diameter of the top cover untill the two parts (diff crankcase and cover) fits exactly. After you have done so you will be able to assemble the diff with oil and gears.