Any reason not to do this?

Oklacarcollecto said
This rear end was in the car and running fine before you had things messed with so why would you have to cut things to put it back together if all the correct parts were used?

I think you need to find someone that knows how to fix your problem without screwing anything up even worse.

So, during your first ever differential changeover from open carrier to a rebuilt suregrip unit, you already knew everything and understood any issues that may come your way? Assuming this reply was directed at me and not the builder of the third member. Hard to tell here.