'92 300SE. Car doesn't shift into 5th gear at speed.

Shifter is "vague" in the D/4 quadrant. Putting it into D, the paddle settles between the D position and the 4 position.

Drive down the freeway at 60mph - pull the shifter to the 4 position - no change in RPM. Push it over to the D - no change either.

Any suggestions on where to start?

BTW - car has had a new motor recently - don't know how careful shop that did the work was when reconnecting the transmission linkage, etc - maybe this is the source of the vague shifter linkage?

Thanks!