what rear end is in 1985 323i will it fit my 318is?

[1991 e30 bmw 318is]

in my car now is a open 4.10 and i wanted lsd and a little better on the highway. so i found a local 1985 323i parts car i was just wondering whats in it for a rear end? and will it fit my 1991 318is?

[Madhatter]

someone in here will be able to tell you for sure, but i think the iS was one of the models that used the medium case, 188mm diff like the 6 cylinder range.

So yeah, if the iS used the larger diff compared to the other 4 cylinders, it should fit. However, the 323i usually came with a 3.64 rear, but it might not be an lsd anyway.

[blueapplesoda]

its got a med case 3.23 or 3.91 (some sport models), LSD if its sport.