MACDOE---- The 38# FW if for the 617 engine to make it run smoother. It has nothing to do with what ever Transmission is hung on the back end.
Flywheels sourced from PNP are $27 plus the tax & enviro fees.
Our 80 240D runs just fine with the stock 28# FW.
This is the first thread I read anything about using the 38# FW in a 240D, don`t see what that would accomplish.
I did notice when I installed the 28# 240D FW in the 85 300D when I swapped in the 4-spd manual, there is a vibration noticed when I would slow down in 4-th below (say) 27 - 2800 RPM`s. that was some where around 50+ MPH. Dropped it into 3rd and it ran smooth. never noticed the vibs in 1st thru 3rd gear.
I have the 38# FW to install when ever I get off my Butt and quit procrastinating about what project to get to first or finish up on. I have 7 vehicles, and only one running.

Thinking about it doesn`t get anything done.

HMMMM.....if I go to PNP today I can get to the projects tomarow..........
As Skippy said........
"I used the same flywheel on my 300D, and it has some pretty noticeable vibration with some combinations of speed and load, but this is easily managed by shifting a little later."
Charlie