yes it can be done ... the nitro quake , thunder quake , and axis all use the same chassis ...
http://www2.towerhobbies.com/cgi-bin...?&I=LXCTT8&P=7
so you just need the reverse / and 2 speed / and front and rear drive shafts ... then clutchbell and transmission set up ...
check out this forum ... [link=http://home-bound1.com/tqforum/index.php?sid=30f311542c979c081ec8b0ecb0752f18]forum[/link]
and ask mvaughn12 ... i think he has a whole transmission for sale ...alot cheaper than tower .. may be able to find one on e-bay also ....
there are alot of guys on that forum i believe that did the conversion ....