id hate to see u waste cash on a new transmission......
what colour is the rustlers chassis? black or grey?
does it have a slipper??? if it does check what gears it has...
I bet its already got the steel gear on the slipper shaft. so rather than buying a new gearbox.... why not just get the steel idler gear? its under $5 and...
rather than replacing the diff housing/gear with 2381x get the HR sealed diff housing or Traxxas ball diff....u could also replace the housing with a RPM housing.... or get the proline transmission....