Hi guys. New to this so please go easy on me if I have out this in the wrong place. I have a spare rear axle for my y60 and now I have blown the original I am going to put the spare on. I really have no idea whats inside it and whether they will match. What dose the code on the top of the diff casing mean. 1 says 408 and the other says I think 827. Other than that I will have to resort to counting turns. Plus I have no stamp in the doors to tell me ether.