Thank you ! I just stripped the rear diff part and all the internal gears was fine like new . I was a bit scared of opening everything up incase I made a balls of it but I’m glad I did as feel a bit more confident with working on it now …. 👍
So when I bought my 18th scale monster truck I’m sure when you turned a wheel by hand when the car is off they all turned, now they only turn across an axle when the car is off and spinning by hand they all turn when the car is on and the throttle is being pressed. Is it worth stripping to see...