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
1 x Lego Technic Model Set 9398 4x4 Crawler Electric Motor 9V Power Functions L Grey Red Tested with BA Incomplete Incomplete: Amazon.de: Toys
LEGO Technic 9398 4x4 Crawler, Sastavljeno
LEGO® TECHNIC™ LEGO® TECHNIC™ 42139 Terensko vozilo - Baby Center internet trgovina | Dobrodošli u obitelj.