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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 07-25-2004, 09:35 PM   #1 (permalink)
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does anyone know if there is a difference between a 1984 318i automatic rear differential and a 1985 318i manuel rear differential because i have two 318i and we are converting the 1984 to a 5 speed but we don't know if we have to change the differentials around too.
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Old 07-26-2004, 12:37 AM   #2 (permalink)
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the diff housing will be the same but the gearing may be different. Look for a metal tab about 2" long and about 3/8" wide, it will have the ratio stamped in it.
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Old 07-26-2004, 01:03 AM   #3 (permalink)
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i know for the e36's you must change out your differental when coverting auto to manual this is due to the gearings, If you were to put a manual tranny on the auto differental you would have a top speed of about 80mph but you would get there pretty fast hahaha, but yeah you do need to change out the differental!

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Old 07-26-2004, 09:04 PM   #4 (permalink)
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whats the build date of your car?

3.64:1 > 11/83 3.91:1 < 11/83
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Old 07-27-2004, 08:31 PM   #5 (permalink)
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where would i find that on the car. and for which car the one with the manuel in it or the automatic. we are converting the automatic to manuel.
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