Of course getting the oil right is essential too, but....

The benz tranny is very sensitive to shift lever adjustment. You must take off the levers to adjust properly, align the shifter levers all in a row using a drill bit, then put the levers on the tranny all in their neutral position and adjust the rods which go between so they go in without moving the levers on the shifter or tranny at all.

Of course the bushings on the rods also should be renewed at the same time if there is any play in them.

And finally there are bushings inside the shifter which can be renewed as well if it is sloppy.

It is all pretty easy to do really.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.