Tmaxx Brushless Convert

I have a T-Maxx Classic as previously mentioned I'm converting over to Brushless. I have the ECU, Motor, Bateries, E-maxx Tranny and Diffs already my problems lye in the tranny is narrower then the mounting holes on the T-maxx chassie. I do have an Emaxx chassie but would prefer to use the aluminum one. Also switching to the E-maxx tranny changes the steering and other things. Also does anyone have a line on what drive shafts and axles I should use? If you guys would like a full list of what I have let me know

Dustin