uh-oh - is that a non-hardened steel pinion i see? you might want to try the kyosho plastic spur - that's what i'm going to try once i get my eXT8 back in a week or two. supposedly you just have to drill the holes to 4mm and it'll fit.
the last few hardened pinions i bought from RCM have been the near-black color... but maybe the older hardened ones weren't that dark. it was just a guess.
i know, when i drove mine , i got done and 5 min. later i started to take apart my g3r, i knew i would never want to drive it again, and besides i used the electrics out of it
but it is lighter , easy to work on , and handles much better