60 ft lbs according to this chart, I have used these specs for every diff I have worked on so far and I haven't had a problem.
http://www.differentials.com/technic.../set-up-specs/

Just thinking about how much it took to remove, going by feel, I think I'd be able to bust lose 45lbs easily without the help of a cheater bar. However they didn't come off that easy, and to avoid a busted knuckle by laying into the wrench, I used my cheater bar. With that said they had very little effort to remove with it.

Going off of feel.... I'd say 60lbs sounds about right. Also 45-60 is not a huge range... I'd be very surprised if something was stated to torque to 45lbs, and then that item strip at 60lbs, as generally there is some wiggle room in those torque settings. It would be kinda crap to have hardware that torques to 45lbs but then strips at 46lbs or or even 55. I may split the difference and do 55lbs lol.

Is it a common problem for these to come loose or what? If the Factory said 60, and I did 55, would that be setting up for disaster? And since these bolts are impossible to be rusted on, can I assume the amount of torque to bust them loose would roughly be the amount to put back on? I'm completely new to diffs and just don't want to cause more issues than I'm trying to fix.

Thanks for all the help

I did factory torque of 45 ft/lb and have not had a problem. I think you'll be just fine at 55 ft/lb.

I've never heard of anyone having issues with them loosening up.

You've been a huge help ever since I've joined. Thank you. As well as everyone else who has helped me out too!

Got er done today. In the end had a friend do the hammering while I held the socket/extension in place. I tried it other way around at first but he's a complete newb, and it got sideways a bit.

But I bought 3 of them when I ordered them ;)

outer seals were much more a pita than I planned. I had to Dremel out quite a bit of rust to get those buggers in there. But no leaks, no burn smell. Drove it about 10 mins with some hwy time even and pan was not warm at all. Very happy.

Also fwiw. 55lbs was good. I'd say as tight as I would want to make it. Any more than that and it would have gotten uncomfortable feeling fast. As someone who has effed up and stripped plenty of thread in my day, No way would I want to do more than 55lbs.
People who said 90lbs are crazy.