LEGO 42099 Upgrade | LEGO Technic 42099 Power Mod | Swapped Gears | Switched Gears | 42099 Test
LEGO 42099 Upgrade: Switch gears to get extreme power for LEGO Technic 42099 4x4 X-treme Off-roader. This is a 5-minute mod. Video contains how to part and test part. For 42099 review, see my other videos.
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