1994 Mercedes-Benz SL320 Q&A
1994 Mercedes-Benz SL320 Question: transmission
This sounds like the linkage is disconnected or the transmission is failing. I suggest taking this to a Mercedes shop to have it looked at to determine the cause. Here are some near you: http://repairpal.com/directory?address=03580&car_brand_names=Mercedes-Benz - Bret Bodas
High mileage vehicles may develop a leak from one or more of the transmission oil seals.
...ive driveshaft movement. If not repaired, damage to the driveshaft center support bearing, transmission, or differential can occur.
The engine wiring can degrade because the insulating material falls off leaving the bare wire exposed. This can cause many problems depending on which wires are exposed and what they touch.