Is an 8 1/4", 2.45:1 diff housing exclusive?

thesiren74 said
Do a 8.8 ford rear , 3.73 and you can get disc.

I've read a bit about the 8.8 Ford swap, but don't know that I need the extra beef. I doubt I would exceed the design limits of an 8 1/4 with a mildly tuned /6.