Another FLM Conversion Build-Help

Also, for those who have asked about the electronics I'm using, here is the list:
Steering-Hitec 5955TG
Brake-Hitec 645MG
Reverse-Hitec HS-81
ESC-MGM 22418
Motor-Neu 1521/1Y (1577Kv)
Battery-Neu 6S 5000mah and Flightpower 6S 5000mah (both fit!)
Radio and receiver are the Futaba Fasst 2.4Ghz 3 channel.
The tranny is a 3 speed with the plastic 44t gear replaced with a hardened steel Hot Racing gear. Diffs are the aluminum case ones with steel pin inserts. Ring and pinion are the new HPI ultra hardened steel (#86922). Starting out with a 52/20 spur-pinion ratio and working from there.