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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 02-20-2009, 10:12 PM   #1
OkStateMET
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Rear diff leaks!

today i got my oil changed and the shop told me my rear diff was leaking, every where! although they said it was full of fluid? I was told it is leaking from the input shaft and both drive axles. I havent ever herd of bmw having problems with the rear diff, im thinking its just the seals or gaskets? but i do have 145,xxx miles. any suggestions/input can i fix this my self?
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Old 02-22-2009, 02:56 PM   #2
OkStateMET
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ttt need some advice....
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Old 02-22-2009, 11:04 PM   #3
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anyone?
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Old 02-22-2009, 11:29 PM   #4
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the seals must be leaking and they are pressed in - not diy

the removal and installation of the diff is diy and can be done in about an hour (in and out), but I have a ton of experience with it

you will need the proper e-Torx socket for the bolts securing the input and output shafts
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Old 02-22-2009, 11:45 PM   #5
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yeah mine was leaking at the input shaft at like 45k miles.. and now there's a tiny leak at one of the axles.. You're lucky to have it leak at 145,xxx miles LOL... get the seals done or just buy a low mileage differential and put that in, that way you can fix and mod your car at the same time.
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Old 02-22-2009, 11:45 PM   #6
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good idea
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Old 02-23-2009, 03:15 AM   #7
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If you have a manual 323 then you have a 3.07 final drive. This is a great opportunity to buy a 3.46 diff from a local junk yard and just have it installed. Not only will you get a performance increase but you'll also have your car fixed for less money.
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Old 02-23-2009, 11:58 AM   #8
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i have an automatic, would i still want a 3.46? I don't know very much about this, i think this improves the acceleration with a smaller rotating final drive gear??? smaller gear rotates more times, spinning the wheels more times, thus faster? is this the concept?
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