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Hi.. everyone.. I'm a new member subscribed last week. So this is my 1st posting here. Now I want to introduce my own renovation (or remodeling) of TECHNIC 42039 racing car that is capable of 4WD and 2 or 4 speed transmission features and so on... With a desperate that I need to go finish the TECNIC 42039 racing car renovation (or remodeling) going on for several months, I start a review about the result of my 42039 renovation version 3.0. First, through the video below we will introduce an overview of 42039 renovation version 3.0. The next additional video introduces the previous version 2.2 with features of 2WD and 2-speed transmission etc. The main feature included in renovation version 3.0 are listed below. -. RC engine room hatch opening feature of the original 42039 model -. Front axle renovation for 4wheel-driving (4WD) -. The reinforcement of power transmission path to the rear wheel axis -. Optional 2 or 4-speed transmission function In the following content introduces a modification information for each part. 2 or 4-speed transmission feature For the purpose of extended range, a four-speed asynchronous sequential shift gearbox option is added, 2-speed synchronous transmission as well. (With a minimum of effort adapted in accordance with the object, 2-speed vs. 4-speed selective transmission) In particular, our 4-speed sequential gearbox is inspired by the 4-speed compact transmission that is designed by SARIEL and that of TECHNIC 42056 PORSCHE 911 GT3 RS original model. In the video below, it shows the assembly of 4-speed sequential gearbox. (Sorry, the assembly of 2-speed gearbox is not ready yet) The pros ans cons of 2-speed synchronous and 4-speed asynchrosous transmissions described herein are appreciated as follows Division 2-speed synchronous 4-speed asynchronous High torque drive suitable inadequate Shift range narrow wide-range Shifting function stability low hight In conclusion, Choose 2-speed synchronous transmission, if you seek to improve the driving force Choose 4-speed asynchronous transmission, if you pursue a variety of speed and a technical completeness The challenge is 3 or 4 speed synchronous transmission upgrade. 42039 chassis renovated Sometimes with rear-wheel axis of the original 42039 models, transmission gears are impatient for a large force drastic departure or steep slopes in the progress of strong torque being transmitted to the rear wheel through a transmission shaft. So as to compensate for this problem in the renovated version, the rear-wheel axis structure has changed as the following video. The renovated 4WD front axis is at the heart of the renovated version 3.0. In other words, it describes the steering and front wheel drive shaft modifications as possible at the same time. The under-body of the renovated version compared to that of the original 42039 model is modified as follows -. Fake engine is replaced by 4-speed gearbox -. S- motor mounted under the hood -. Installations of the renovated chassis etc. In the video below you can see the renovated chassis production process using four L-motors. The final assembly process By combining each part-specific modifications result described above, the following video of the last shows the final assembly process of 4WD 42039 racecar bodywork. By finishing the renovation of RC motorized 4WD racing car, I could try another renovation with 42056 PORSCHE 911... I hope to introduce the renovated version of 42056 in the near future.. Thanks to you all reading this review to the end... Bye