The 2.9 and 4.0 transmissions share the same bell housing. The difference in the M50D-R1 manual transmission on the 2.9 and 4.0 is the 2.9 M50D-R1 has a lower first gear than the 4.0 version.
The 2.3 and the 3.0 each have their own bell housing that won't interchange with any other engine.
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