Special Differential Tools

Dav3 · 07-19-2023, 08:21 AM

Looking to DIY removal and install of new pre-built lsd pumpkin but having a hard time figuring out how to approach the install

TIS guideline keep mentioning special tools on multiple steps of disassembly and reassembly

For those who have done it, what special tools are and aren’t needed? There’s plenty of aftermarket special tools for E9x but haven’t found matching TIS codes for our E89.

Afaik, rear subframe is E46 and E85 based. But don’t want to waste money on the wrong kit.

Any advice is appreciated!

B21 · 07-19-2023, 10:14 AM

In general posting this with the E85 guys may solicit more responses as they seem to do quite a bit of track work and see, to be popping in various LSD units..

However I di know when I had an E89 N20 car with a third part diff that the dismantlers had removed the crown nut that rendered it unusable and I was quoted around £450 to refurbish it.

The nail in the coffin is that the 35i /35is has a welded on crown wheel that needs to be machined off..unlike most of the other E89 and E85 diffs with bolted on crown wheels..so that puts the 35i diff beyond most home mechanics..

All IMHO…

07-19-2023, 08:21 AM	#1
Dav3 Major 949 Rep 1,027 Posts Drives: G87 M2/E89 35is/F21 M140i/GT4 Join Date: Oct 2016 Location: Europe iTrader: (0)	Special Differential Tools - Z4 E89 35is Looking to DIY removal and install of new pre-built lsd pumpkin but having a hard time figuring out how to approach the install TIS guideline keep mentioning special tools on multiple steps of disassembly and reassembly For those who have done it, what special tools are and aren’t needed? There’s plenty of aftermarket special tools for E9x but haven’t found matching TIS codes for our E89. Afaik, rear subframe is E46 and E85 based. But don’t want to waste money on the wrong kit. Any advice is appreciated! __________________ Current: G87 M2 / F21 M140 / 718 GT4 \| E89 Z4 35is Gone: E92 M3 \| RS3 8V \| E82 1M \| AMG GT-S \| X3M Comp \| F80 M3 \| Juke Nismo RS \| E85 Z4 M Roadster \| R58 Coupe JCW \| F87 M2C\| F87 M2 \| F22 M240i \| F82 M4 \| E89 Z4 2.0i \| F56 Cooper S \| E92 330i \| R56 One
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07-19-2023, 10:14 AM	#2
B21 Captain 153 Rep 611 Posts Drives: E89 Atacama Yellow 35is Join Date: May 2022 Location: Scotland..God’s own country iTrader: (0)	In general posting this with the E85 guys may solicit more responses as they seem to do quite a bit of track work and see, to be popping in various LSD units.. However I di know when I had an E89 N20 car with a third part diff that the dismantlers had removed the crown nut that rendered it unusable and I was quoted around £450 to refurbish it. The nail in the coffin is that the 35i /35is has a welded on crown wheel that needs to be machined off..unlike most of the other E89 and E85 diffs with bolted on crown wheels..so that puts the 35i diff beyond most home mechanics.. All IMHO… __________________ Much modified 2011 Atacama Yellow 35is…previously a much modified 2012 Atacama Yellow 20i MSport Change history here… https://www.dropbox.com/s/8h1vabklgz...0List.pdf?dl=0 Build thread here… https://z4-forum.com/forum/viewtopic.php?t=131886
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