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General E46 Forum
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02-20-2012, 11:51 PM
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#1 |
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Registered User
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3.07 -> 3.46 Diff, Different Axle Flanges!?
I bought a 3.46 diff out of a 325i auto and am aware of having to swap the input flanges to match up to my 330.
However, my axle flanges are not matching up. Photos below: 3.07 (my original diff):  3.46 (new diff):  As you can see the 6 bolt pattern does not match up, what is the easiest way to swap these?
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02-20-2012, 11:52 PM
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#2 |
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buy different axles?
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02-20-2012, 11:57 PM
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#3 |
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You can use the flanges off the old diff. Just be careful when you swap them. If you don't preload the bearings properly, they will go bad in 6,000 miles. I can't give you any more guidance than that, but Dan at diffsonline can, or you might be able to Google it and find a DIY for swapping the flanges properly.
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02-21-2012, 12:04 AM
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#4 |
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Looks like with some pry bars and some force it does pop out pretty easy. Updates on the 3.46 to follow!
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02-21-2012, 12:07 AM
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#5 |
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Poppng it out is easy. Popping it in, the right way, is easy to screw up, at your peril. Seriously. If those bearings fail, you'll be replacing the diff.
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02-21-2012, 12:11 AM
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#6 |
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Really. Seriously. Do some reading, or you'll be on here asking about a howling rear end in 6,000 miles, and you will not like the answer.
http://forum.e46fanatics.com/showthread.php?t=901282
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02-21-2012, 12:25 AM
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#8 |
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TX78666 it sounds like you're talking about the input flange? I don't think you have to do any sort of preloading on the output flanges...
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02-21-2012, 12:52 AM
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#9 |
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Could be. It's late, and I didn't do the swap on mine. The shop that did it, ended up eating the cost of another diff. If I had screwed it up, I would have paid more attention to what went wrong. :-)
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02-21-2012, 01:04 PM
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#10 |
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Registered User
Join Date: Jan 2005
Location: Huntington Beach -Surf City USA
Posts: 15,108
My Ride: M3 & 323Ci (sold)
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Yes your 330 has beefier axles and different output flanges.
You just pop them out and swap. The INPUT flange is the tricky one.
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02-21-2012, 04:01 PM
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#11 |
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Just an update, was at the shop until 1am but the diff is installed with no leaks! The difference is definitely noticeable! Considering I got the diff for $220 shipped this mod is worth it for sure! Wish it was LSD though, maybe down the road.
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02-21-2012, 06:07 PM
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#12 | |
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Quote:
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