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Parts Interchange
All of the 4, 5 & 6 cylinder engines can swap around the manual transmissions & bell housings. With the exception of the bellhousing for the M189 motor. So, your suggested swap is quite doable. But, you will most probably need a drive shaft (length) and/or rear differential (gear ratio) change too (and why).
As for Automatics, there are 3 issues there:
1. The valve body & modulator being tuned to the motor/fuel source.
2. The drive shaft connection.
3. Torque converter vs fluid coupling.
(and of course, the funny bell housing for the M189).
The 280S, 280SL, "early" 280SE and 300sel 2.8 all had the same transmission.
The "late" 280SE, "late" 250 and 280 all had the same transmission.
The two groups are diffent based on #2 and #3(?)
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