E30 Zone

I have a 316 and a 320i which i am going to make one good car out of, now somthing that i dont know much about is diff's, i believe the 316 has a 3.91 and the 320i has a 4.10 now i am going to use the 320i engine so would i be better of leaving the 4.10 in or swap it for the 316 3.91 diff

What differance is there between the pair

Pros and cons

any opinions will be great

Putting the 3.91 in will give you slightly better top end and slightly improved economy at the loss of some acceleration.

Personally i would keep the 4.10 in there!