Anyone know of a 5 or 6 speed tranny or auto I guess that will adapt to an Isuzu 6bg1 engine?
I don't know but what did the Isuzu engine come out of?
If its the same series engine as what comes in NPR box trucks there's plenty of adapter kits out there. They just gear they're sales pitch towards using that 4cyl motor but if the engine series is the same it should be the same block pattern/crank end just with 2+ cylinders.