Sometimes we can't do it the way the factory may have. Iv'e done two (one gas, one diesel) where I needed to swap a manual flywheel onto an engine originally equipped with an automatic. Nw bolts, new pinion shaft bearing, new clutch and pp. No vibration problems at all.

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Hanno
'79 6.9 Sold (after 27 years)
'83 280SL, 5 spd.
'94 E320 Sdn. 5 spd conversion
'02 E320 Sdn.(on loan to mom!)
'87 300E (5 spd. conversion) Sold
'05 E500 Wagon