Neu is still mounted in the back spot but it sits a little bit lower to the chassis. There is actually somewhere in the manual (or on the Traxxas site - can't remember) a listing of what gear combinations will work with the low-CG mount and the high CG mount.
Using the stock 68 spur gear your gearing on the low-CG mount is limited.
“Everyone has a right to be stupid; some people just abuse the privilege.”