An Old project never completed to be done G4

[suicideneil]

What model emaxx did you buy for tearing down?

You should be able to fit the 3906 tranny to the 3905 chassis buy widening the motor mounting area/ hole and drill new mounting holes- only really need 4 for the old tranny rather than 8, just enlarge the hole so the tranny fits, then mark the locations for the mounting screws & drill them with a 4mm drill bit.