on stock gears you will probably have to replace the detroit when you go to 4.56's. the cutoff for gears is 3.73/3.93 so if you are lower numerically than 3.73 you will need a new detroit carrier to take the 4.56's. personally i would have waited till i found a 44 or ford 8.8 rather than buy...
hey i probably know those guys too. they are the guys i normally wheel with but I couldn't go that night. i'm also a local indy guy and would like to go wheelin sometime. i don't know when i can though cuase my boss won't let me have a weekend off. i was supposed to go to attica this weekend...
If you find you need a t-case drop it is really easy to do yourself. I made one out of solid aluminum 1x1 stock i had laying around. you will have to heat up the stud that is threaded into the frame rail. a acetalyne torch worked well. if you don't have one then it could be a PITA and you...