W140 -93. The tranny was taken down and rebuilt 4 years ago. The oil and filter was changed 3 months ago, oil level is okay.

I bought the car after the tranny build, and I must say that gears works really good, no problem at all. Shifts really smooth.

But placing the car in D instead of P or N wil make it shake back and forth for a short while. It's hardly a second, but quite rough. It also happens when going from P or N to Reverse sometimes (more often then rare thought.)

I have a little high idle maybe, around 750. When selecting D gear, the idles rises as the car shakes... hm...

Any tips at all?
Is there something that I can check for my self? Before turning it in to a tranny shop.