ORIGINAL: ttoks
the ofna 1:7 has a two speed center diff however
Incorrect. It has a 2 speed center tranny not a center diff. It is a solid shaft with a set of 2 speed gears ans the 2 speed clutching system. It does not have a diff as well.
The Mammoth line has had a 2 speed center tranny set up since it was produced, even the new XTM giant version of the Mammoth comes with a 2 speed center tranny.