Hi,
I have owned a 1967 230SL (automatic) for ~25 years now and it just did something new on my normal Sunday morning drive.
On the highway, I was going ~80 MPH and the engine suddenly revved up as the automatic transmission appeared to slip into neutral. I was not touching the gear shift. I backed off the gas and it ran normally again.
2 miles later, it did it again at ~30 MPH. It is in the shop and my mechanic reports that the linkage (and little grommets that fail so often) are fine.
Any ideas on what this could be are welcome as it is one of those "not always failing" issues that can be frustrating to diagnose.
thanks,
Tom