BIG difference ! .
The Mercedes Automobiles tend to have the final drive unit ('pumpkin' ,' chunk' etc,) mounted to the unibody along with the transmission so the drive shaft doesn't move up/down , it only spins . thus , a flat rubber " Flex Disc " is used to absorb vibrations .
Lesser Automobiles have the entire rear axle and final drive as a single unit , attached to the vehicle by the suspension so the drive shaft not only rotates but it must , perforce , move up and down several degrees at the rear end and a pair of U- Joints are used to allow this drive shaft movement .
Mercedes and other fine cars, do use Constant Velocity or " CV " joints between the drive axles on each drive wheel and the fixed pumpkin , this ' CV ' joint works similarly to a U-Joint although it is constructed *very* differently .
I've never seen a W-123 with any U-Joints yet but there's also much I don't know about Motor Vehicles .
-Nate
Giancarlo Asked :
>
> Is there a difference between u-joints and flex disks or is it another way to say same thing? I am having carrier bearing replaced in a'85 300DT and am seeing references to both of these in addition.
> Thanks in advance,
> Giancarlo
>
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