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Posted by Ritter on April 27, 2001 at 15:17:01:

In Reply to: Shifter rattles,change bushing ¿what i have to do? posted by Ricardo Roel on April 27, 2001 at 14:24:14:

BMW E30 M3 Shifter Vibration

If you own an E30 M3, you already know what a unique car you have. However, ownership does have it's price.

One common issue with E30 M3s is the shifting action and its degradation over time. Some have it worse than others. Common issues include:

Buzzing and vibrating shifter at 4000rpm.
Shifter rattle at specific speeds.
Shifter "wagging" at specific rpms and speeds.
Notchy shifting.
Some obvious sources of the vibration is caused by:

Broken shift knob attachment or not securely engaged.
Loose or broken exhaust bracket to bell housing.
Worn or broken transmission mounts.
Worn or missing spacer ring (foam piece within gear selector rod joint)
The spacer ring (which is actually a small piece of black foam) is the trick to taking out the buzz. Normally, it deteriorates over time as it's a small foam piece about the size of a sugar cube. It sits inside of the gear selector rod joint and will, over time, compress and fall apart. After a few years, your shifting gets buzzy since it's not doing the job any longer.

Replacing the Gear Selector Rod Joint and associated parts with a genuine BMW part will take a lot of the "play" and vibration out of the assembly, if you do a short shifter or not. The recommended parts to replace include:

These parts should be purchase from a BMW dealer.
UUC Motorwerks does NOT offer these parts for sale.

Gear Selector Rod Joint1 #25 11 1 220 198 $11.00
Dowel Pin 1 #23 41 1 466 134 $0.51
Tension Bushing 1 #25 11 1 203 682 $1.50
Spacer Ring 1 #25 11 2 226 585 $0.51

Installation of the parts requires removal of the exhaust and driveshaft, so use the appropriate equipment or have a professional mechanic perform the work. While the entire assembly is apart, replacing the bushing bearing (# 25 11 1 220 832), UUC Motorwerks sells Delrin Bushings to replace this wimpy rubber piece to take out the slop in the carrier during the shifts.

Replacing the transmission fluid with a synthetic such as Redline MTL is a common upgrade as it's friendly at the track and makes things easier when the weather is cold. Purchase 2 quarts as your tranny takes less slightly than that. Upgrading the stock transmission mounts is a smart idea. Details on how to do that can be found by clicking here.

Overall, it's a lot of work, but when done, it's worth the effort. Good luck.

Contributed by Ben Liaw.

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