[MBZ] Play in driveline

[archer]

In neutral my '83 240D stick-shift has a typical amount of play in the 
differential.  When shifted into the first, second, and third gear the play 
is much less and probably what could be expected after 155,000 miles.  But 
when I shift it into fourth there is more play and it seems like it twists 
against springs or resistance of some sort.  The only thing I can think of 
is the springs on the clutch disk compressing.  Still, that seems unlikely 
since I'm turning the drive shaft by hand without much force.

When driving it seems like there is more play than usual in the driveline.
Anyone know what might be going on?

Thanks,
Gerry Archer
'83 240D and 300D