You can also buy used parts. Alot of people upgrade there gears and
have the old one laying around in perfect condition.
If you go to a garage make sure they have done it before. For example
if they do not replace the $5.00 seal on the axle when they pull them
and it leaks you will have to spend another couple of hundred dollars
removing everything and replacings the seals.
Ask on the news group for a name of a garage near you town. You can
also buy a superior 35 if you want a full upgrade.