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
Amazon.com: LEGO Technic 9398 Rock Crawler : Toys & Games
LEGO Light Kit for Crawler Vehicles 9398 and 20014
LEGO MOC RC ☆ Βatman Tumbler LEGO 76240 UCS ☆ Motorized and remote controlled with power functions from LEGO 9398 Crawler ☆ Batmobile from the Dark Knight by reckless_glitch | Rebrickable - Build with LEGO
Lego 9398 Crawler modified in 2023 | Crawlers, The originals, Monster trucks
LEGO Technic 9398 4X4 Crawler | Rapid Online
Amazon.com: LEGO Technic 9398 Rock Crawler by LEGO Technic : Toys & Games
Gently Used Lego Technic 9398 4X4 Crawler - 100% Complete in BOX — Brickset Forum
Lego Technic 4 X 4 Crawler 9398 - NO REMOTE / COMPLETE / SAME DAY SHIP | eBay