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 4X4 Crawler (9398) Building Kit 1327 Pcs Truck Lego Set | eBay
Legoism: Technic 9398 4x4 Crawler Review: A Double Milestone
9398 - Lego Technic 4x4 Crawler - Page 36 - LEGO Technic, Mindstorms, Model Team and Scale Modeling - Eurobricks Forums
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 : Lego: Toys & Games
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LEGO TECHNIC 4x4 Crawler 9398 for Sale in Riverside, CA - OfferUp