Thanks for the comments and I understand. I have presented in other forums, but Eurobricks, it was not me who posted! Thanks to whoever did it for me!
Well I'm not using the gear box and use that relationship in each axis is> XL motor> 12 t> 20 t - 12 t> 20 t - 8 t> 24 tons on each wheel. It is the relationship that more work before wheel knob used in the output of the XL but lost a lot of torque.
Soon I will be with the original links, but unfortunately the tires to do what he does, just not that original.
Thanks again!