Tranny -
As said, I think you need everything espicially the tranny as the gearing will be vastly different than a gas engine. A gas auto trans with a stall of 2,6XX RPM wouldn't do much for you. A stick would be better, but I bet every gear from 2nd on up is a different ratio than a gas eng.
Just a WAG but. . .
Gas usable RPM ~ 1500 - 5500
Deisel usable RPM ~ 1000 - 2800
Then the vibes, I bet the engine mounts are a different formula too! Stupid stuff but it all adds up to give it
ECM, Tach, filler, pumps. . . . long list past the engine bay
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95 Cam, V6 1MZ, Auto A541E, LE >245,000 miles!