with yrou stock carrier you can just replace the gears and everythign will be good. there are a few things you can do to make the rear stronger whiel you are at it though. i woudl suggest a trip over to
www.thirdgen.org
read through the tech articles. there are 1 or 2 about building a stronger 10bolt. it is mostly simple stuff like a better cover and using studs instead of bolts.
later
tim