Higher Torque Servo

I would like to use a Servo with more Torque than the existing Vex Servo.
Per the Mythbusters article, they mentioned two. One is 10 times stronger, the other is half that. Form the pics I see those also have 3 wires.
Specifically, I want to know…
Can they just be plugged in to the micro-controller or do they need to have a speed controller?
If it needs a speed controller, can I use theone inside the vex servo and how would that be done?
Lastly, Would there be any programming involved?
The models are Hitec HSR-5995TG and HS-5645MG.

I won’t have a problem with the shaft part.

This would really solve a space/gearing/torque issue we are having.
And for any help I’ll be your best friend all day!

I don’t know about the Hitec HSR-5995TG and HS-5645MG, but here are some general information links…

Try these links from Vexforum:

Vex Servo
Other Motors
Spike relay support
Victor support
Vex Motor

Try some links from VexFan:

Alternate Motors and PowerSupply
Adding Different Motor

also
You can upgrade Vex Servos/Motors with ball bearings

Please share what you find out about the HSR-5995TG and HS-5645MG…