Where can I get the best repair manual for a 1991 350SDL? Haynes has nothing listed that I can find. I did find some places that sell a CD set for the W126 thru 1991 for $149.95, is this what I need, if so can I beat this price somewhere?

Thank you.

I think FastLane and/or PartsShop offer the MB CD. That's the most comprehensive manual you'll find. Nothing on the transmission.

Haynes has a UK version W124 book that covers the 603.961 (you have a 603.971), but it only tells you which bolts attach which parts. Nothing to help you diagnose problems or understand how systems work... not that the MB CD is straightforward in either regard, IMO.

Sixto
91 300SE
87 300SDL
83 300SD