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5 minute upgrade - turn the LEGO Technic 42099 4X4 X-treme Off-Roader into a capable crawler! - YouTube
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LEGO Technic 42099 4X4 X-treme Off-Roader stage 2 upgrade - even more power with only 4 extra gears! - RacingBrick
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LEGO MOC 4x4 X-treme Off-Road Truck - 42099 B-Model by technicbasics | Rebrickable - Build with LEGO
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A little dirt never hurt: LEGO Technic 42099 4x4 X-treme Off-Roader [Review] - The Brothers Brick | The Brothers Brick
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