i just bought a 1991 318i a month ago and i was pullin out today the car just stopd, and started making very loud banging noises everysecond. so i pulled over, and put it in first and i was rolling back with clutch out and ebrake down, i did the same with reverse. (i was on a hill). does this mean that my diff or sumthing in the rear is broke? and if it is what kinds of diffs or rears can i put in there to make the final drive better such as a 4.10 i think my friend has in his, idk im very new to bmw's tho.
thanks for all the help