It will be interesting to see how the tranny and axles hold up for sure. Even if eventually have to use a RC tranny and axles it is still going to be a nice body.
Hi, I am Ondřej from the www.3dsets.com team We are glad to see your build of the Rancher 4x4. Based on our experiences with our test models, you cannot expect any failure of the transmission – at least with our recommended motor and 2S accumulator.
However, the most stressed part in the drivetrain seems to be the "big" gear in the differentials – on my test model there was one(!) failure of this specific gear. The gear was printed from PLA filament and Rancher was operated by small kids, and they totally torture it So I re-printed this gear from PET filament and it never happened again (so far).
Sure, its ok to presume that full-metal gearboxes and axles will be more durable than our 3d printed versions, but we tried to design all parts with respect to the characteristics of 3d printing technology. For example, all shafts has 10 mm in diameter... And one thing – keep in mind the price of the complete model and possibility to re-print literally any part, for free ;-)