Its not a pretty sight when you blow up a rear end, I know from the first tranny in the fiero, those little spider gears left two separate 6"holes in the tranny case and put a couple nice size dents in the rear part of the engine compartment (luckily out of sight for car shows). you should prolly spend a little money on a good rearend unless your planning on having a sex change in the near future! :shock:
price out how much it would cost to convert to a 9" then that will be your budget limit for having somebody make you a custom spool. it wount come out of a catalog but you should be able to find a machine shop that will be able to make you a custom spool for less $$$ then a whole new 9" setup.
or you can let your GF race it and problem solved for free! :lol: