An alternate for the 42158 Mars Rover. The set has a rather unusual inventory, with LOTS of knobs and U-joints. I here proposed a model built around a brick-made differential and a transmission with a fake (electric) engine. I managed to use all knobs but two! The set also features some nice functions: a central articulation for steering and an opening trunk to deploy some communication material and equipment. The front axle is also pendular.
Picture gallery: https://bricksafe.com/pages/jyd80/42158-alternate-mobile-transmission-unit/v1.0
Presentation on TechLUG.fr (in French): https://www.techlug.fr/Forum/viewtopic.php?f=5&t=12978
Building instructions available at Rebrickable: https://rebrickable.com/mocs/MOC-169740/alter-lego/42158-alternate-mobile-transmission-unit/