I have a 1991 300TE that wants to hang in 3rd gear, doesn't want to
shift out till over 40mph. Also, on the highway, it will continually shift
down into 3rd at speeds right around 60mph. If I drive it at 65-75, I
have no problem. Do these have some kind of bowden cable or adjustment
to correct this. Trans has no slipping or other issues so I don't feel
it is a serious issue requiring rebuild.

any insight?

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81 Mercedes 300SD 289k.......SOLD
82 Mercedes 300CD 252k......slow ride

82 mercedes 300 SD...mi Unknown
83 Mercedes 300D ????ksniff..gone too
84 Mercedes 300D 148k........SOLD
85 Mercedes 300TD 386k and holding some one elses project