E-Slayer build on the horizon

[phatmonk]

So I have a Tekno Slayer conversion a Slayer a MMM v2 a Motor now do I need a servo Y harness or a center diff conversion ?but the specs say on the Slayer that it has a forward only trans.Long story short is I want to go with a pinion and no clutch and use the MMM brakes.But on the otherhand the instructions for the conversion says I need a y servo harness when using the clutch setup.I have converted 2 1/8 buggies and a Losi 8T truggy those I have a good working knowledge of what to do but with the traxxas Slayer and 2 speed I need some guidance.Do I need RCM Motor mount?