[implements]

I had the previous one:

http://www.technicopedia.com/853.html

- which didn't have a rear differential. My father (an engineer) made one from regular bits which was spun by a large pulley with (trigger warning!) the centre drilled out so an axle could freely pass through it.

[blunte]

I had this one as well, I think around age 7. It was my first "expert" set. Legos were my life until computers!

It was also great when the electric motors and battery box came out. With a bit of gear work, you could actually take that 853 and motorize it... working engine and all.

[implements]

Yes, if memory serves I you mounted the motor on the front bumper in a way that looked a little bit like a supercharger. It made the rear axle shudder around corners - hence the MacGyver’ed differential!