Urgent help please, Z4 E85 3.0si diff replacement/options.

Commando_Rob

Commando_Rob

Member
 London
Afternoon all,

So after buying Wilksd Z4 3.0si I’m looking at my options for repairing/changing the noisey rear diff.

My thoughts,
1 replace like for like with same E85 3.0si manual 3.23 ratio diff, quite a few on eBay so most sensible option.
2 change for a E86 3.0si manual rear diff to improve acceleration as believe this is a 3.46.
3 fit LSD assume will ideally need a working diff before doing this? Have contacted Birds and they want 2.5K for Quaife! Don’t want to spend this much.

Any help advice really appreciated.
 
Straight swap. I should clarify the 3.73 must be from a roadster auto, coupes with auto came with a 3.64 iirc.
 
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You could look at the Blackline which is half the price of a Quaiffe. I just fitted one to my 130i. It transforms the power out of corners, tracking you around them and firing you out. Get a good local diff rebuilder to do the swap and it should be around £700 on top of the LSD purchase with new bearings plus about £100 to swap the diff in and out. Worth a look. They have got very good reviews on the Baby BMW forum. You can get 5% off a first order.
 
Hi all just to update on this I’ve got abit of a situation that could really really do with some help please, so I’ve purchased a diff, from fellow z4 enthusiast 2004 e85 z4 manual 2.5 m54 3.23 diff PN 7514149 that from research should be compatible with my 2006 manual 3.0si, who also said he would fit for a reasonable fee, so long drive to his location, old diff out and we’ve got the new diff in but there is a 7mm shortfall from prop shaft to diff! Any ideas or help
and advice really appreciated as car is on axle stands on side of a road.
 
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Guide to swapping the flange here

J

Thread 'Greasing Differential Input Flange - Fix for Clanking Differential - E85'

The Problem

My 2004 BMW Z4 E85's differential clunks on acceleration, specifically in 1st 2nd, and 3rd gear, at low speeds. The clunk only happens when engaging or disengaging the accelerator. I lift my foot off the petal and *clunk* it disengages, and I put my foot back on *clunk* it engages.

The sound seems to come from the back of the car and is really starting to annoy me because it is audible from outside the car, and can be felt on the inside.

For more information on how this repair was researched & which options were considered please view this thread...
  • Like

They might be the same, but... Worth checking
 
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