42075 First Responder

I began my LEGO Technic journey in the summer of 2021 by motorizing the 42075 First Responder set. I added motors for driving and steering, and also installed custom LEDs. Overall, I’m happy with the result as the car has great playability - especially in the dark, thanks to the bright LEDs. Of course, there’s always room for improvement.

Specs

• RWD, without a differential. The rear axle uses a 12:36 bevel gear instead of a normal differential for better “offroad” capabilities.
• Steering: PF Servo motor
• Propulsion: PF L motor
• Powered by a CaDA RC unit
• Custom lights - powered by a separate battery box (2 x AA), placed on top of the cabin
• Manual winch (like in the original set)
• Working fake engine
• Opening doors and hood
• Seats, steering wheel
• Robust chassis - proven by 1 year of regular play
• Gear ratio: 3:1
• Curb weight: 480 grams
• No raisable light tower

Photos