It's not as common a task as the routine maintenance things we talk about mostly.
Only thing I can remotely help you with is the driveshaft. From the manufacturer there are alignment markings on the two sections of the driveshaft. On the short section it is one short mark on one of the six sides where you fit a wrench (near the junction with the other section). On the long section it is two marks shaped like a portion of a V and I think they are on the yoke of the universal joint.
If I feel energetic later this weekend I'll get you a picture with these parts highlighted.
For my part, I would try replacing the center bearing and carrier mount on the 300D driveshaft - and get it put back together in alignment.
Its going to be pretty tough to shorten the 240D driveshaft and keep it strong and in balance.
Ken300D
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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles
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