Yes I know this thread is old.
As has been stated there is no "transmission" the engine/reactor out puts electrical energy that is shunted to the Myomer/muscles to move the Mech. The Mech is fully capable of guiding itself for basic movement which is controlled through is own computers. The pilots nurohelmet is required for any balance requirements outside the basic movement positions the Mech encounters. As stated the controls of the direction and stance are controlled from the pilots seat, various selections on the sticks, pedals, dash direct different attitudes for the mech. Example the "crouch" movement would only be a selection available while stopped.
There is very little explained on how a pilot and Mech select "pick up" something and actually target the point where the Mech's hands will grab an object. Even reaching out to grab a part of an Enemy mech during combat would be rather difficult if not for the Mech's sensors direction the limbs after the pilot selects that action. Requiring the whole "canon storyline" of mech sensor awareness and some form of basic self awareness. Example: the pilot directs the mech to walk forward in this direction, the mech "see's" or sensors detect the ground in front of it and places the feet accordingly.
The action of changing direction (forward/reverse) would require the mech's sensors to calculate the load on the legs at this and the next few steps, the angle and rotation of the body, the terrain, and current speed to bring the entire chassis to a full stop. In most cases, turning would be a better option for the pilot depending on speed and terrain. But if keeping your forward armour, well, forward then a stop would be required. Everyone thinks of big metal mech's as slow trundling machines, I would beg to differ. Drive systems (motors/ gears/ hydraulics/ Pneumatics) whatever, are slow - period. This Mech is driven by muscles, which are 300 times faster at reacting than any normal drive system. (considering the weights involved) Only recently, (2013) through new robot designs are scientists finding the speed and strength of the new "nanofiber woven" muscles out preforming "standard" drive elements. This timeline is 3050 and beyond and they have Myomer electrical activated Mech muscles. [Fast, strong, durable, and can be replaced if damaged.] An example of some of the "slower" electrically driven large systems would be the auto industry assembly robots, they zip around with very large weights and most are about 1.5 to 2 tons in mass. Now replace the motors with muscles and you might get a super fast, nearly dangerous assembly arm.
So back on topic, only controls the pilot would make is to select "reverse", the mech should be making all the other calculations. ( and receiving balance feedback from the pilot for the change in inertia)
1. No transmission.
2. reactor only produces power
3. Gyro provides basic stabilization
4. Pilot only "directs" the mech where to move, not how
All for now,