ZPOST - View Single Post - Swap stock 2006 Z4M diff for freshly rebuilt 2001 E46 M3 diff w 4.10?

eggman51 · 10-03-2021, 11:32 PM

Would you swap a stock 2006 Z4M diff for a freshly rebuilt 2001 E46 M3 diff w 4.10 final drive ratio?

A mate is parting out his E46 M3. The diff is from a 2001 E46 M3. It has <3000 km on it since a fresh rebuild when he swapped in the BMW motorsports 4.10 gearing.

My 2006 Z4M is driven more on the track than the street. I plan to do a 4.10 final drive ratio at some point. Using this diff will likely be half the cost of what I was planning to do. My plan was to do a diffsonline 3 clutch limited-slip diff, which will be significantly more expensive.

I understand there are differences between the E46 M3 diff and the Z4M diff. If I understand correctly, the Z4M diff is "superior" to the E46 diff, particularly the earlier E46 M3 diffs (the one I can get is an earlier model).

Does anyone know if these differences are material to track performance?

What are your thoughts on this swap for a car that is mostly driven on the track?

10-03-2021, 11:32 PM	#1
eggman51 First Lieutenant 199 Rep 342 Posts Drives: 2006 BMW Z4 M Roadster Join Date: Jul 2018 Location: Vancouver, Canada iTrader: (5)	Swap stock 2006 Z4M diff for freshly rebuilt 2001 E46 M3 diff w 4.10? Would you swap a stock 2006 Z4M diff for a freshly rebuilt 2001 E46 M3 diff w 4.10 final drive ratio? A mate is parting out his E46 M3. The diff is from a 2001 E46 M3. It has <3000 km on it since a fresh rebuild when he swapped in the BMW motorsports 4.10 gearing. My 2006 Z4M is driven more on the track than the street. I plan to do a 4.10 final drive ratio at some point. Using this diff will likely be half the cost of what I was planning to do. My plan was to do a diffsonline 3 clutch limited-slip diff, which will be significantly more expensive. I understand there are differences between the E46 M3 diff and the Z4M diff. If I understand correctly, the Z4M diff is "superior" to the E46 diff, particularly the earlier E46 M3 diffs (the one I can get is an earlier model). Does anyone know if these differences are material to track performance? What are your thoughts on this swap for a car that is mostly driven on the track?
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