Ultimate upgrade for the 9398 4x4 crawler with pendulum steering (no servo needed). I also made a pendulum steering file in the rebrickable link you can download and have a closer look
Made an upgrade of the 9398 with XL motors and gave it 30% more additional parts. This is my MK2 version as my first upgrade was not as successful. Also it uses
Lego Technic 9398 Rock Crawler Preview | The Lego Car Blog
LEGO Set 9398-1 4 x 4 Crawler (2012 Technic) | Rebrickable - Build with LEGO