WLToys A959 High Speed RC Car Step-by-Step Upgrade #3: Metal Gears (Fail!)

Finally! The First Wave of Upgrades! Testing out the WLToys A949/A959/A969/A979 1/18 4WD High Speed RC Car Complete Set of Metal Gears from Banggood! Includes complete instructions and demonstration. Absolutely nothing wrong with the upgrade metal gears, but the combination of plastic and metal turned out to be a differential-disaster! Need more metal ... solution coming up! A little puzzled why I haven`t seen anybody mention this issue on any videos here? Unless I`m missing something? Would love to hear about your personal experiences upgrading your WLToys A9x9 in the comment section. Let us share. Hope you will follow along in this series. Most upcoming upgrades are compatible with the WLToys A959-B/A959-A/A949/A969/A969-B/A979/A979-B and other versions in the WLToys 1/18 4WD Vortex High Speed RC Car Series. The WLToys A959-B & A959 Versions and Upgrade Parts was kindly provided by Banggood, free for review and tests. Part numbers and links to each upgrade will be available in the description box of each in