Diff oil for new build. Stock or no?

[Dserbin]

I'm going to be starting my build in the next couple weeks. I'm not sure what electronics to get, so should I stick with stock diff oils for now or should I think about going thicker. This will be for bashing and just messing around the field sort of thing, no racing or track.

 

[Billl DeLong]

Start with the stock fluids and see how the truck feels, then if you need to many any changes, consider the following guide from HUDY to suit your needs: