ok mustang crew, my buddy(stangman16) has a 99 GT, and we were talkin the other day. somehow we got on the subject of switching out our rearends..... anyways he likes the IRS (his car is stock and he doesn't plan on modding it any further than this), i think IRS sucks. i drove a GT for a while, and i just like the solid rear better. its better for burn outs and i dont notice any MAJOR difference in the handling. so we were wondering how hard is this operation?? will we need any extra parts?? even better, does anybody know of site with detailed instructions?? thanks for any help...