Quote:
Originally posted by DuckRyder
The later diffs are not an easy fit, it's more trouble than its worth,
E21 323i carry a 3.45:1 ratio and they are somewhat hard to come by. 320/6 and us 320i up to and including 79 run a 3.64:1 diff which is in my opinion the best performance ratio. Later 320i run a 3.90:1. (its really too short, causes 1st gear to be nearly useless.) 315 I'm told run a 4.11:1.
"iS" models and some non iS cars have limited slips. You can Identify a limited slip by a large "S" painted on the top or side and an "S" on the metal tag attached to one of the rear bolts.
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Just to amend your post, duckryder,
In the USA,
320is diffs run a 3.91 ratio and are all LSD, (first gear too short? I could really wind the car out in first, maybe not the same down under?)
320i diffs are 3.64
We also never officially got the 323i here, although there are a lot of them that have been imported. It's hard to find parts for some the owners that call me up.
We also never got the 315 or 316.