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      03-01-2008, 03:28 PM   #9
GregW / Oregon

Drives: 2015 M4 Coupe, 2012 ML350
Join Date: Nov 2005
Location: Lake Oswego, OR

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Originally Posted by Sick Speed View Post
Does anyone know what rear diff is being installed in the new E92 M3?

Thanks in advance. SS
From the Aftersales Training document.

Final drive
In principle, the final drive is assembled in the same way as in the E6x M5/M6. It is, however, a separate new development.

The bevel gear shaft bearing is a frictionoptimized, double-row, angular-contact ball bearing. The gear ratio between the bevel gear and the crown gear has been adapted to the engine speed and gearbox ratio of the M3.

The final drive ratio is 3.85:1.

The 215 gear set (crown wheel diameter 215 mm) has been temperature and noise optimized. A friction-reduced gearing is used.
The housing of the final drive has been adapted to accommodate the double-row angular-contact ball bearing. The flanges for the propeller and drive shafts are the same as those used on the E6x M5 and M6.

The transmission housing end cover has been modified to ensure optimum gear oil cooling and bevel gear lubrication. The end cover has more ribs, which improves heat exchange. The internal styling of the end cover is adapted according to the size of the differential and the final drive ratio.

This Mfinal drive also has three bearings, with two front bearing and one rear bearing.

Fully variable M differential with locking action
This unique limited slip differential design is based on the E46 M3 and the E6x M5/M6 limited slip differential, where it is described in detail. The function of the limited slip differential has been adapted to ensure that the M3 develops
the best traction at different engine speeds and in every road situation
Attached Images

Greg Lake Oswego, Oregon, USA
2015 M4 Coupe - Silverstone/Sakhir/CF
2012 ML350

Last edited by GregW / Oregon; 03-01-2008 at 08:35 PM.