The Pin mod is fantastic. And I would still be using it if I didn't have the Center Diff.

From indoor to outdoor all I had to do was remove the pin and the Truck became a little 2wd handling 4x4 for indoor, slide in the pin, and it became a monster power 4x4 rolling over the Losi's on the 8th scale tracks around here. I even had two front Diffs, one 30k, one 10k for the swap and that's all I needed to do Track to track. (for weekend warrior-ing)

It holds a place in my wee little heart, for making me fall in love with the Sc104x4. Up until then it was a "strained" relationship that I wasn't going to give up on.