[MBZ] 450SL Tranny ?

[Rich Thomas]

My buddy's 79 450SL tranny has started acting up -- holding (what I 
think is) the 2-3 shift at 35-40mph.  He says it does not shift right 
sometimes, will rev much higher, then shift.  I have not yet driven the 
car to see what it is doing, but suggested first thing is a new 
filter/M1 fluid change.  See what that does, about due for it anyway.

? is -- Is this tranny like the 79 TD's, vac shifted?  Maybe a bad 
connection?  Modulator, etc. that goes bad?  These could be easy fixes I 
guess, would not indicate something more dire.  (OK that is maybe 3 ?s 
but they are all kinda the same)

Thoughts?

--R