XRAY - Model racing cars

Hi,

I´m deciding witch Tx/Rx I will buy for my T3.

I see there is few room to mount the servo, the Rx, the esc and the motor in the left side of the chassis.

I have a standar size servo, a 36mm diameter motor and a 43x39mm esc.

So, remain very few space for the RX.

Using a 48 Pitch spur instead of a 64 Pitch spur, will help me to save space ???
For the same gear ratio, the 48 Pitch uses a pinion and a spur with less diameter ???
Will this help me to mount the motor more backward ???

Hope someone could help me.

Thanks.-