Quick view Add to Cart Arrma 3S/4S BLX & MEGA Metal Gear Front/Rear Transmission Module Set ARA311156 $159.00 inc GST Arrma 3S/4S BLX and MEGA Metal Gear Front/Rear Transmission Module Set. This is a replacement part intended to fit various Arrma 3S/4S BLX and MEGA 550 vehicles. Key Features: Steel input and main differential gears are precision manufactured for... Compare