Open RC tractor new transmision system

Modification of the original transmision system of the Open RC Tractor.

Do you need it the following components:

1x The main motor, with 200rpm it is not so fast but it is powerfull;
https://es.aliexpress.com/item/25MM-6V-200RPM-Powerful-High-Torque-DC-Gear-Box-Motor/32290134897.html?spm=2114.13010608.0.0.QFXyVY

2x The smallest bearings, used for satellite gears;
https://es.aliexpress.com/item/30Pcs-MR74-Open-Miniature-Bearings-Ball-Stainless-Steel-Mini-bearing-4X7X2-4-7-2-mm-High/32