Need or want, lol ?
Here's SMD's list of option Team C (Ansmann) parts for 2 & 4wd:
http://www.smddirect.co.uk/team-c-2/...e-64/index-all
Just finishing building an X4te, only planned upgrades as & when needed will be carbide diff balls & possibly the spur gear, i'm also using Kyosho wheels instead of the kit ones.