The Tamiya TT02 Aluminum Gearbox Cover and Upper Arm Stabilizer by GPM, model TT2012AN, is constructed from 7075 aluminum to provide rigid protection for differential internals and to stabilise the upper arms. Engineered for a tight fit to reduce differential play, this upgrade helps maintain consistent gear engagement and reduces wear on drivetrain components. The package includes the specified Grade 12.9 fasteners for secure assembly and is suitable for hobbyists focused on durable, performance-oriented upgrades.