Having now driven a 4spd 240D for a couple weeks, I'd have to say an Overdrive gear could be nice - but even nicer in a 300D where the extra displacement would be a kick. I doubt it would raise the top-speed dramatically in the 240D, but the lower rpm's in the 70-80mph range would be nice for the noise-level. It sure does love cruising at 70 though - there's still power to pass.

The owner's manual says top speed in the W115 is 86mph - seems like the motor is durable enough to handle an increase into the 90's a OD gear would add without hurting it too much. Plus the fuel economy would be great in those higher cruising speeds....

Regards,
- Ryan

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'95 E420 - 'Shadowfax' 138kmi.
'92 Volvo 740Turbo Bard 193kmi
'74 240D - 'Ol' Green' 4spd Manual 104kmi. (sold )
'77 300D - 'Red' 223kmi (sold)
'75 240D - 'Bianca the Blue Bomber' (sold)