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 Technic 9398 Rock Crawler Preview | The Lego Car Blog
4X4 Crawler 9398 | Hard to Find Items | Buy online at the Official LEGO® Shop LU
LEGO MOC Lego Technic 9398 functional crawler alternative B model by Secon Yan | Rebrickable - Build with LEGO
Amazon.com: LEGO Technic 9398 Rock Crawler by LEGO Technic : Toys & Games
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: 4x4 Crawler (9398) for sale online | eBay