Flex disc on 4-matic

[Pelle]

I have searched and find out that there are two ways of changing the flex disc.
One method is to lower the gearbox a bit and the method is to remove the exhaust pipe.
Since i have a 4-matic it does not seem to be such a good idea to lower the gearbox.
The transfercase front shaft will maybe not feel so good.
The flex disc seem to be bigger on the 4matics.
It´s 150mm.
Does anyone with experience on 4matic have any suggestion ?

In Sweden we name the flex disc "Hardy"

MB 300E 4M -89

Pelle