Dont pay no attention to dumb and dumber there. Tex knows his stuff so he is the man to listen to with the motor and revo.

I had a TZ in my revo but the crank cracked on me. I guess I could have sent it back to EB mods(which is where it was from) But decided to toss it. SO if your using a EB TZ,chaning out the crank might just kill the reason for a TZ.
Is a TZ needed? Not really if you ask me. Maybe outdoor if the track has some long parts where you can let the motor go. But other then that,you might want the low end push that a TM has.