How to Build 4 link suspension with Coilovers & Bypass Shocks | Barra FJ Landcruiser Ep#5

Build Episode #5 for the next generation Barra powered FJ45/80. In this video we take you through everything there is to know about designing and building a triangulated rear 4 link system including: - 4 link setup vs 5 Link (Panhard setup) - 4 Link design process - Using CAD to design a 4 link suspension setup - Why 80 series landcruiser chassis are better than Nissan Patrol - Manufacture of diff Truss and link brackets - Why we chose Nissan Patrol diffs for the build - Importance of weld sequence on Diff - Link arm material selection - Bush vs Heim Joints - Differences between Types of shocks - Getting a setup like this road legal in Australia WIN 1053 piece Kincrome Toolbox: https://designedandbuilt.com.au/kincrome-tool-giveaway/ 4 Link Calculator: https://www.crawlpedia.com/resources.htm 4 Link explained (Busted Knuckle): https://www.youtube.com/watch?v=BTWZgVx8Y6o Build Playlist: https://youtu.be/qBhfV6SV6cw?si=9Px9DiHYVLsu9j_v Build Intro Video: https://youtu.be/qBhfV6SV6cw Build Video #1 (Chassis Modifications) : https://youtu.be/w_ueJVoqmqI Build Video #2 (Custom Floors and Dash): https://youtu.be/eIBXo4NK-6s?si=-hlyq0qTPCTnjWPA Build Video #3 (Barra to 8 Speed): https://youtu.be/bWgkAFK3hPI Build Video #4 (Tube Work): https://youtu.be/C2SP5K6sh1U Channel Sponsors: - Kincrome - Goodyear - Stedi - www.lcs4x4.com.au 0:00 Introduction 0:30 Advantages of Panhard setup vs 4 Link setup 5:38 Designing a Triangulated 4 Link Setup 7:06 Using a Link Calculator 8:16 Using CAD to design a Triangulated 4 Link 9:08 Why 80 series is better than patrol chassis 9:44 Frame Modification benefits 11:21 Plasma Cutting 4 link Brackets 12:11 Folding 4 link brackets using CNC Pressbrake 13:05 Why Nissan Patrol diffs are better than Toyota Landcruiser 15:16 Welding suspension brackets to diff 19:50 Chassis end Brackets 21:00 Fitting 4 link brackets to the chassis 23:00 Benefits of 7075 Aluminium Link Arms 24:24 Fitting Links and chassis brackets 26:37 Packaging Triple Bypass and Coilovers 26:57 Building shock mounts 28:07 Benefits of Triple Bypass and Coilover setup 30:05 Setting up Triple Bypass shocks and coilovers 33:02 Load Paths 33:36 Getting a custom suspension setup road legal in Australia