This has prolly been covered before but just a heads up to all those who want to use the IRS TC3/TC4 'Big Dawg' bones or the TC4 stock bones:
Be SURE to get the TC3/TC4 outdrives; the slots are bigger to accomodate the pin cushions. And...
If you're using MIP rear bones-n-axles in Pro4 delrin outdrives:
Be SURE to shave the ball-end down almost to the pin on the short half of the outdrives.
After that, you should have some nice looking, hopped-up differentials
-JB