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Old 11-19-2009, 08:20 AM   #1
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e46 gear sets

Does anyone here know whether it is possible to fit gear sets from other BMW models in the e46 (188 non M3) differential housing? If I would like to change to a 3.73 gearing, would e.g the ring & pinion from the X3 fit?

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Old 11-19-2009, 03:48 PM   #2
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It seems like the entire X3 diff fits, why not just swap it in?


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Old 11-20-2009, 11:46 AM   #3
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The rules for the class we compete in state that we can only use the e46 housing. We are, however, allowed to change the gearing. Thus it is of interest to find out whether the ring & pinion from other models could fit in the e46 housing. Diffsonline sells used 3.73 gearsets for the e46 and as this is not a native gearing these have to come from another model. Perhaps the X3 or the e90 that have these in some models...
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Old 11-25-2009, 12:17 AM   #4
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A little info from my experience of trying to fit an e36m lsd into our diff housing... it won't work or it'll take some modification, at least the LSD ones won't fit without shaving the housing.
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Old 11-25-2009, 12:12 PM   #5
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The X3 carrier is identical to the E46 carrier. Just swap the whole thing. You'll just need to swap input/output flanges.

If you need it to look the same then just swap the bottom half of the carrier housing between the two. e.g. labeling

Last edited by SpeedDemon; 11-25-2009 at 12:14 PM.
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