You're running a 550HP stick. I don't know why everyone thinks they are smarter than the thousands that have went before them and want to run an 8 3/4 or for that matter a stock 9 inch.
Spend a few thousand on your 8 3/4 beefing it up and changing the gear in it. Then when it breaks spend the $2k on a Dana 60 (better off an S60).
I just don't get why guys fight this after all these years.
What is the love for the 8 3/4?