I've been dreaming of doing the conversion for a while. The trans will bolt on, but the location is not the same. Therefore, you will have to modify the shift rods and the drive shaft. Do a search on the subject, someone posted a link to a site with a w123 turbo with a 4 or 5 spd conversion.

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2001 Dodge Ram 2500 Cummins Turbo Diesel - 4x4, auto, 3.54 gears, long bed
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'92 300D 2.5 Turbodiesel - sold
'83 300D Turbodiesel - 4 speed manual/2.88 diff - sold
'87 300D Turbodiesel - sold
'82 300D Turbodiesel - sold