Keep in mind that the lower bolt on the steering coupler must be completely removed as it locks the shaft in place when its through the hole, due to a depressed area in the spline. Also, the upper bolt on the steering coupler is very easy to access by lifting the cover inside the cabin area, contrary to the information Mr. Bryce gave. If you only need to replace the coupler, it can be done from inside the cabin without removing the steering box in about 2 hrs max.

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Richard Wooldridge
'01 ML320
'82 300D 4.3L V6/T700R4 conversion
'82 380SL, '86 560SL engine/trans. installed
'79 450SL, digital servo update
'75 280C