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
Lego 9398 Best Sale - benim.k12.tr 1689519317
Lego Technic 4x4 Crawler - 9398, Hobbies & Toys, Toys & Games on Carousell