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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 05-25-2007, 05:00 PM   #1 (permalink)
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Rear?

i need a new rear diff. its a 1991 318i, what types of rears will bolt right up and is there any i can put on to improve the proformance of the car. i think my friend said he has a m3 rear on his but im not sure, i just got the car a month ago.

thanks for all your help
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Old 05-29-2007, 03:19 PM   #2 (permalink)
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Search around. I think the 91 318is came with a 4.1:1 LSD?
Probably the best bet. check the 318is versus the M3 diff.
I know some guys switch to lower ratios like the 3.73LSD
Some go the other way. depends on application Steet, autox, drag, track, fun, groceries, gas milage etc LOl
I think one 325 had a 4.1 in the autox Sunday and he said he was cranking it up to 4th gear where I was in 3rd. but thats with M20 6cyl
Good luck.
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Old 05-29-2007, 04:18 PM   #3 (permalink)
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ya the M42 powered 318i's usually have a 4.10 or 4.27 i believe...not much shorter you can go there
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Old 05-31-2007, 04:22 PM   #4 (permalink)
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so i could just buy a stock replacment or a used one and be good to go? thanks for all your help guys, and i would be using it for just fun lol
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Old 05-31-2007, 06:05 PM   #5 (permalink)
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since it's for fun be sure to get an LSD.
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Old 06-01-2007, 02:12 PM   #6 (permalink)
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haha hell ya, i cant wait till it's running again
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