Hi,

if you want move your diff so it will works from MB CLK 55 AMG W208 or E55 AMG W210, the diff from W209 or W211 will not fit in the body of Crossfire. The next point is that you will move the ratio in your gearbox pcm too,in the other way the ABS/ESP get a different rpm from wheel sensors and your ABS/ESP doesn´t work all time long.

In the attachment you will find picture from CLK 55 AMG W208 diff.

regards V8Max