LantanaTX,
Thank you for information, the tutorial you sent is very similar to one at www.jcrecordings.com website in whitch you can find more information about DAS, you can also buy some stuff.
I have now finished installing the engine and gear box in its housing and I'm trying to finish various fixations.
I faced a problem of transmission shift axle 
, because the origin axle was fixed with 3 bolts instead of 4 bolts in AMG 55K Gear box. I'm trying to recover the attachement (three bolts) from the original box and set it on the 55 box. If this method does not work, I have to change the whole rear axle from the gearbox up to wheels which will be expensive enough.
I am aware that the AMG transmission lines are strengthened compared to other models, but I prefer to continue with the original until exhaustion.
Karim.