Heng Long 1/16 RC Tank Upgrade Steel Gearbox for 1/16 RC Tank Parts Accessories. For Heng Long 1/16 RC Tank Upgrade Parts. 1 Pair of 1/16 RC Tank Gearbox. Size: approx. Material: Steel. Suitable for 3838 U.S. Pershing M26, 3839 U.S. M41A3, 3878 Soviet KV-1, 3889 Leopard 2A6, 3918 Abrams M1A2, 39058 UK 2 etc.