New PMD Auxiliary 4:1 Transmission Gear Box for Tamiya 1/14 Semi King Hauler. This unit slows the truck down in all gears increasing the power by 4 times thus reducing load on the motor and increases run time. It come with the transmission and drive shaft, this is a 4:1 auxiliary transmission gear machined aluminum case, steel gears with 5 ball bearings and joints installed between the main transmission and the first differential. Does not come with installation instruction.Drive shaft might require shorten or extended depend the model and length your semi is. The item "Speed Reduce Gear Box Transmission 41 Tamiya RC 1/14 Semi King Knight Hauler" is in sale since Tuesday, November 14, 2017. This item is in the category "Toys & Hobbies\Radio Control & Control Line\RC Model Vehicle Parts & Accs\Body Parts & Interior\Cars, Trucks & Motorcycles". The seller is "logisticsshop" and is located in Fast shipping. This item can be shipped worldwide.