The original remote was missing, so I thought replacing the remote and receiver would be a nice challenge.

Parts used:

• An old 2 channel 40Mhz remote and receiver “Graupner b4 ssm 40b”.
• This ESC “40A Brushed Esc Electronic Speed Controller Voor Wpl C24 C34 Mn D90 MN99S MN86S” https://aliexpress.com/item/1005005133523842.html for converting PWM into a DC power supply for the already mounted DC motor.
• A servo “MG90D Digital servo” to replace the original limit-switched-motor, for steering. (The “SG90 tower pro” with plastic gears didn’t last)
• Some 3d printed parts for steering.

The original remote had

• 1 channel (off/on) for the back connector (to attach a trailer)
• 1 channel (off/left/right) for steering left/right
• 1 channel (off/fw1/fw2/bk) for driving

So i lose the option to control the back-connector, but i gain variable speed and steering control.